Trans-Dihalogenostilbene Compounds and Liquid Crystal Electro-Optical Devices Using Them

1. Field of the Invention

The present invention relates to trans-dihalogenostilbene compounds useful for liquid crystal electro-optical devices, liquid-crystal compositions containing them and liquid crystal electro-optical devices using them.

2. Discussion of Background

Liquid crystal display devices have been used for watches and electronic calculators and in recent years for various applications including measuring devices, automobile meters, copying machines and cameras. Accordingly, various functions including a wide temperature range for operation, a low voltage for driving, a quick response and chemical stability, are required for such liquid display devices.

However, at present, there is no single material which by itself satisfies all of such requirements, and it is a common practice to satisfy such requirements by a liquid crystal composition prepared by mixing a plurality of liquid crystals and non-liquid crystal materials. Accordingly, it is desired to develop a liquid crystal material or a non-liquid crystal material which is excellent in one or more functions, if not in all the required functions.

For a twisted nematic (TN) type liquid crystal cell in the field of display devices using liquid crystal, in order to prevent formation of an interference fringe on the cell surface which causes deterioration of the outer appearance of the liquid crystal cell, it is necessary to set a certain specific value for the product of the anisotropy of refractive index (.DELTA.n) of the liquid crystal material filled in the cell and the thickness (d) of the cell. Since the value of .DELTA.nd is set at a certain specific level, it is possible to minimize the value d by using a material having a large value .DELTA.n. If the value of d is minimized, the response time (.tau.) can be minimized in accordance with a well known formula of .tau..alpha.d.sup.2.

Thus, a liquid crystal material having a large value of .DELTA.n is a very important material useful for the preparation of a liquid crystal cell having a high response speed and yet free from an interference fringe.

On the other hand, practically feasible liquid crystal material is in many cases prepared by mixing several or more components comprising compounds having a nematic phase around room temperature and compounds having a nematic phase in a temperature range higher than room temperature, and is usually used in the form of a liquid crystal composition.

Further, it is known that the response time is positively interrelated with the viscosity of the liquid crystal material.

Accordingly, it is an important object to provide a material which has a large value of .DELTA.n, small viscosity and excellent compatibility with other liquid crystal materials or non-liquid crystal materials and which is chemically stable.

It is an object of the present invention to provide a novel material which is capable of solving the above-mentioned problems.

The present invention provides a trans-dihalogenostilbene compound of the formula: ##STR2## wherein each of A.sup.1 to A.sup.4, which are independent from one another, is a trans-1,4-cyclohexylene group or a 1,4-phenylene group, which is unsubstituted or substituted by one or more halogen atoms, methyl groups or nitrile groups and in which one or more CH groups may be substituted by nitrogen atoms, and one or more CH.sub.2 groups may be substituted by oxygen atoms or sulfur atoms; each of B.sup.1 and B.sup.2, which are independent from each other, is a 1,4-phenylene group, which is unsubstituted or substituted by one or more halogen atoms, methyl groups or nitrile groups and in which one or more CH groups may be substituted by nitrogen atoms; each of Y.sup.1 to Y.sup.4, which are independent from one another, is --COO--, --O--, --OCO--, --CH.sub.2 CH.sub.2 --, --CH.sub.2 --, --CH.dbd.CH--, --OCH.sub.2 --, --CH.sub.2 O--, --CH.dbd.N--, --NO.dbd.N--, --N.dbd.ON--, --C.tbd.C--, --N.dbd.N-- or a single bond; each of X.sup.1 and X.sup.2, which are independent from each other, is a fluorine atom, a chlorine atom, a bromine atom or a trifluoromethyl group; each of m, n, p and q is 0 or 1; and each of R.sup.1 and R.sup.2, which are independent from each other, is a C.sub.1 -C.sub.10 alkyl group, a halogen atom, a nitrile group or an isothiacyanate group, provided that in the case of the alkyl group, an oxygen atom may be interposed in a carbon-carbon bond of the group or in a carbon-carbon bond between this group and the adjacent ring, and in a case where R.sup.1 or R.sup.2 is the alkyl group, some of hydrogen atoms in the group may be substituted by fluorine atoms.

The present invention also provides a liquid crystal composition containing at least one of such compounds of the formula (I) and a liquid crystal electro-optical device having such a liquid crystal composition interposed between a pair of substrates.

FIGS. 1 to 15 are graphs showing the infrared (IR) spectra of the compounds of the Examples of the present invention.

The compounds of the formula (I) of the present invention are novel materials having large values of .DELTA.n, and when mixed with other liquid crystal materials or non-liquid crystal materials to form liquid crystal compositions, the compounds of the formula (I) serve to increase .DELTA.n of such liquid crystal compositions. They have low viscosity and are chemically stable materials excellent in the compatibility with other liquid crystal materials or non-liquid crystal materials.

The compounds of the formula (I) of the present invention are useful for liquid crystal compositions. A liquid crystal composition may be prepared by mixing at least one of them with other liquid materials or non-liquid materials.

The substances which may be mixed with the compounds of the present invention, include, for example, the following compounds. In the following formulas, each of R and R' represents a group such as an alkyl group, an alkoxy group, a halogen atom or a cyano group, as is different from R in the formula (I) of the present invention. ##STR3##

These compounds are presented merely as examples, and various materials may be selected for use including those modified by replacing a hydrogen atom with a halogen atom, a cyano group or a methyl group, by changing a cyclohexane ring or a benzene ring to other six-membered ring or a five-membered ring, or by changing the linking group between the rings.

The liquid crystal composition of the present invention is used by injecting it into a liquid crystal cell.

As a typical liquid crystal cell, a twisted nematic (TN) liquid crystal device may be mentioned, which is prepared by forming a transparent electrode of e.g. In.sub.2 O.sub.3 --SnO.sub.2 in a desired pattern on an inner surface of a transparent substrate of e.g. glass or plastic, applying an overcoat of e.g. SiO.sub.2 or polyimide, as the case requires, disposing a pair of such substrates having horizontally oriented layers to face each other, sealing the periphery of the substrates, injecting a liquid crystal and then sealing the injection inlet, and a polarizing plate is laminated on each side of the cell for use. Other than this, a super twisted nematic (STN) type having a large twist angle which has attracted an attention in recent years, a phase transfer type, a guest-host type, a dynamic scattering type or a combination thereof may be employed. Further, the liquid crystal composition of the present invention may also be employed for a liquid crystal cell of a type whereby writing is conducted not electrically but thermally.

Further, with respect to the cell structure, various types are applicable including those wherein an undercoating layer of e.g. SiO.sub.2 or Al.sub.2 O.sub.3 is provided between the transparent substrate and the transparent electrode, wherein a reflective electrode is employed, wherein a double-layer electrode is employed, wherein a colored polarizing plate is employed, wherein a color filter is employed, wherein a semiconductor substrate is employed, and wherein the cell is constructed as a double-layer device. Thus, such cells are useful for various applications including watches, electronic calculators, measuring devices, various meters for automobiles, games and computer terminals.

The compound of the formula (I) of the present invention can be produced, for example, by the following process. In the following formulas, R.sup.1, R.sup.2, A.sup.1 to A.sup.4, Y.sup.1 to Y.sup.4, B.sup.1, B.sup.2, X.sup.1, X.sup.2, m, n, p and q are as defined above with respect to the formula (I), and each of X.sup.3 and X.sup.5 represents a halogen atom. ##STR4##

Namely, a halide such as an iodide of the formula (VII) is converted to a lithium compound (VIII) by means of n-butyl lithium. The obtained compound (VIII) and a tetrahalogenoethylene of the formula (IX) are reacted at -80.degree. C. to obtain a compound of the formula (X). The compound of the formula (X) is reacted with a lithium compound of the formula (XI) obtained in the same manner as the compound (VIII), to obtain a trans-dihalogenostilbene compound of the formula (I).

In the present invention, the compound of the following formula (II) is particularly preferred, since it has a low viscosity and excellent properties. This compound of the formula (II) can be prepared, for example, by the following process in the same manner as the compound of the formula (I). In the following formulas, R.sup.1, R.sup.2, X.sup.1, X.sup.2, Z.sup.1 and Z.sup.2 are as defined above with respect to the formula (II), and each of X.sup.3 to X.sup.5 is a halogen atom. ##STR5##

Further, the compound of the formula (I) of the present invention wherein R.sup.1 or R.sup.2 is a nitrile group or a nitrile group is introduced in A.sup.1 -A.sup.4, B.sup.1 or B.sup.2 may be produced, for example, by reacting with CuCN the compound of the formula (I) of the present invention wherein a position to which the nitrile group is introduced, is bromine or iodine.

Furthermore, the compound of the formula (I) of the present invention wherein Y.sup.1 -Y.sup.4 is --COO-- or --OCO -- may be produced, for example, by preparing the compound of the formula (I) wherein R.sup.1 or R.sup.2 is a hydroxyl group and then reacting an acid chloride thereto.

These processes are given merely as examples, and various other processes may be employed.

In the present invention, when each of R.sup.1 and R.sup.2 is an alkyl group, some of hydrogen atoms in such an alkyl group may be substituted by fluorine atoms, whereby it is possible to increase .DELTA..epsilon. and thereby to improve the response speed during multiplex drive. Further, as mentioned above, this alkyl group may have an oxygen atom interposed in a carbon-carbon bond in the group or in a carbon-carbon bond between the group and the adjacent ring.

The compound of the present invention and the liquid crystal composition using it has a low viscosity as mentioned above, and is expected to provide a high speed response during multiplex drive without imparing other properties. Therefore, it is suitable for use in STNLCD wherein a layer of a liquid crystal composition is disposed in a fashion twisted at an angle of from 180.degree. to 360.degree. between a pair of substrates.

Typical and specific structures of the compounds of the present invention are as follows. In the following formulas, Z.sup.1, Z.sup.2, R.sup.1, R.sup.2, X.sup.1 and X.sup.2 are as defined above with respect to the formula (I) or (II), and each of Z.sup.3 and Z.sup.4, which are independent from each other, is a fluorine atom, a chlorine atom or a hydrogen atom, and X.sup.6 is a fluorine atom or a chlorine atom. ##STR6##

This compound is the most basic compound and has a low viscosity. This may be further specified as follows: ##STR7##

Further, when it is desired to improve the properties at a high temperature by increasing the clearing point over the compound of the formula (II), the following compounds may preferably be employed. Further, since they have a characteristic of low viscosity, such compounds having three or more rings, may be used taking the compatibility with other liquid crystals and other properties into consideration. ##STR8##

This compound may be further specified as follows: ##STR9##

This compound may be further specified as follows. ##STR10##

This compound may be further specified as follows. ##STR11##

This compound may be further specified as follows.

The compound of the formula (I) of the present invention is preferably such that at least one of R.sup.1 and R.sup.2 is a C.sub.1 -C.sub.10 alkyl group, provided that an oxygen atom may be interposed between a carbon-carbon bond of the alkyl group or in a carbon-carbon bond between this group and the adjacent phenylene group. Further, a linear group is usually preferred. However, in a case where it is desired to impart a chiral nature, it may be a branched group. Specifically, an alkyl group, an alkoxy group and an alkoxyalkyl group may be mentioned. Further, when R.sup.1 and R.sup.2 are other than these groups, it is convenient to use a compound wherein R.sup.1 or R.sup.2 are cyano groups.

By the substitution some of hydrogen atoms of an alkyl group in such a broad sense by fluorine atoms, anisotropy of dielectric constant (.DELTA..epsilon.) tends to increase.

When incorporated to a liquid crystal composition, the compound of the present invention is effective for improving the response speed and thus us suitable for use in a liquid crystal electro-optical display device operated by multiplex drive. Its effects are remarkable particularly when used in a liquid crystal electro-optical display device to be operated under a high duty drive at a level of 1/200 or 1/400 (scanning electrode number of 200 or 400).

Thus, its effects are substantial when it is applied to STNLCD. Namely, as a liquid crystal composition, a liquid crystal composition having a chiral compound to impart natural twist to liquid crystal or a cholesteric liquid crystal incorporated, is employed. Such a liquid crystal composition is used for a liquid crystal electro-optical display device wherein a pair of electrodes on the substrates or coating layers on such electrodes are treated by rubbing treatment so that liquid crystal molecules are twisted at an angle of from 180.degree. to 360.degree..

As a coating layer on such an electrode, a coating layer of e.g. an inorganic material such as SiO.sub.2 or Al.sub.2 O.sub.3, a polyimide, a polyamide or a silicon resin, may be used as mentioned above. Polyimide is preferred since the alignment of liquid crystals is thereby excellent.

Now, the present invention will be described in further detail with reference to Examples. However, it should be understood that the present invention is by no means restricted by such specific Examples.

In the following Examples, "m.p." means "melting point", and "c.p." means "clearing point".

Air in a dried four-necked flask was replaced with nitrogen, and 10 ml of n-hexane and 2.86 g (0.0116 mol) of p-n-propyliodobenzene were introduced. Then, 10 ml of a hexane solution of n-butyl lithium (0.0116 mol) was gradually added thereto under stirring to obtain a hexane solution of n-propylphenyl lithium.

On the other hand, the same operation was conducted using another dried four-necked flask to obtain a hexane solution of n-propylphenyl lithium.

Into one of the four-necked flasks for the n-propylphenyl lithium hexane solutions, 2.5 ml of diethyl ether was added, and the mixture was cooled to -80.degree. C. Then, the system was vacuumed, and 1.4 g (0.014 mol) of tetrafluoroethylene gas was introduced from a gas buret. Then, the interior of the system was returned to atmospheric pressure with nitrogen gas, and the mixture was reacted at -80.degree. C. for one hour. Then, the reaction mixture was returned to room temperature and unreacted tetrafluoroethylene gas was purged with nitrogen gas. Then, the interior of the system was cooled to -80.degree. C., and the other n-propylphenyl lithium hexane solution was gradually dropwise added thereto. After completion of the dropwise addition, the mixture was reacted at -80.degree. C. for one hour. The reaction mixture was returned to room temperature and poured into ice water and neutralized with dilute hydrochloric acid, and then the organic layer was separated. The aqueous layer was extracted with ethyl ether, and the extract was combined to the organic layer. The combined organic layer was dried over anhydrous magnesium sulfate. The solvent was distilled off, and the residue was purified by silica gel column chromatography to obtain 0.5 g of the following desired compound (trans-4,4'-bis-(n-propyl)difluorostilbene). m.p.: 74.6.degree. C., c.p.: 83.8.degree. C. ##STR24##

.sup.1 H NMR (CDCl.sub.3 solvent, TMS internal standard) .delta.(ppm) 0.95 (t,--CH.sub.3, 6H) 1.67 (m,--CH.sub.2 CH.sub.3, 4H) 2.62 (t,CH.sub.2 CH.sub.2 CH.sub.3, 4H) 7.33 (d,d,aromatic,8H)

Further, the IR spectrum (KBr tablet) of this compound is shown in FIG. 1.

In 1 l four-necked flask having a gas supplying tube, 200 ml of n-hexane, 75 ml of dry diethyl ether and 24.6 g (0.1 mol) of 4-(n-propyl)iodobenzene were introduced under a nitrogen atmosphere, and then 86.2 ml of a hexane solution of n-butyl lithium (1.16 mol) was dropwise added thereto under stirring at -80.degree. C. Then, while the reaction system was maintained at -80.degree. C., 10 g (0.1 mol) of tetrafluoroethylene was introduced under vigorously stirring in 30 minutes. The reaction solution was stirred further for one hour and poured into ice water and neutralized with dilute hydrochloric acid, and then the organic layer was separated. The aqueous layer was extracted with methylene chloride, and the extract was combined to the organic layer, followed by drying. The solvent was distilled off to obtain 12 g (yield: 60%) of 1-(4-n-propylphenyl)-1,2,2-trifluoroethylene.

On the other hand, in 500 ml of four-necked flask, 100 ml of n-hexane, 40 ml of dry diethyl ether and 17.0 g (0.06 mol) of 4-iodobromobenzene were introduced under a nitrogen atmosphere, and 51.7 ml of a hexane solution of n-butyl lithium (1.16 mol) was dropwise added thereto under stirring at -80.degree. C. The reaction solution was stirred further for one hour and then dropwise added to a dry diethyl ether solution of 1-(4-n-propylphenyl)-1,2,2-trifluoroethylene (12 g) prepared above at -80.degree. C. The reaction solution was stirred at room temperature further for one hour. The reaction solution was poured into ice water and neutralized with dilute hydrochloric acid, and then the organic layer was separated. The aqueous layer was extracted with methylene chloride, and the extract was combined to the organic layer, followed by drying. The solvent was distilled off to obtain 15.2 g (yield: 75%) of trans-(4-bromo-4'-n-propyl)difluorostilbene.

Then, 4.03 g (0.045 mol) of CuCN was dissolved in 30 ml of anhydrous dimethyl sulfoxide (DMSO) by heating to 90.degree. C. Then a DMSO solution of trans-(4-bromo-4'-n-propyl) difluorostilbene (15.2 g, 0.045 mol) prepared above was dropwise added thereto under stirring. The reaction solution was stirred at 150.degree. C. for one hour and cooled to room temperature. 100 ml of water was poured thereto and the reaction mixture was extracted with methylene chloride. The organic layer was washed with a saturated sodium chloride aqueous solution and dried over CaCl.sub.2, followed by filtration. The solvent was distilled off, and the solid thus obtained was purified by silica gel column chromatography to obtain 11.5 g (yield: 90%) of trans-(4-cyano-4'-n-propyl)difluorostilbene.

The analytical results of the compound are as follows:

.sup.19 F NMR ((CD.sub.3).sub.2 CO) -145.7 ppm (d, 119.4 Hz) -156.5 ppm (d, 119.4 Hz) MS (mass spectrum) m/e 283 (M+) IR (infrared spectrum) 2228 cm.sup.-1 (C.tbd.N)

In the following formulas, Ph means a phenylene group ##STR25##

The following compounds can be prepared by changing the raw material of Example 1, or Example 2: CH.sub.3 OPhCF.dbd.CFPhCN (m.p. 118.1.degree. C., c.p. 173.8.degree. C.) C.sub.2 H.sub.5 OPhCF.dbd.CFPhCN n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhCN n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhCN (m.p. 70.8.degree. C., c.p. 163.6.degree. C.) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhCN n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhCN n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhCN n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhCN n-C.sub.9 H.sub.19 P OhCF.dbd.CFPhCN n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhCN CH.sub.3 OPhCF.dbd.CFPhCH.sub.3 (m.p. 70.0.degree. C., IR spectrum: shown in FIG. 6) CH.sub.3 OPhCF.dbd.CFPhC.sub.2 H.sub.5 CH.sub.3 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) CH.sub.3 OPhCF.dbd.CFPhC.sub.4 H.sub.9 (n) CH.sub.3 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) CH.sub.3 OPhCF.dbd.CFPhC.sub. 6 H.sub.13 (n) CH.sub.3 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) CH.sub.3 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) CH.sub.3 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) CH.sub.3 OPhCF.dbd.CFPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhCH.sub.3 C.sub.2 H.sub.5 OPhCF.dbd.CFPhC.sub.2 H.sub.5 C.sub.2 H.sub.5 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5 C OPhCF.dbd.CFPh.sub.6 H.sub.13 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5 C OPhCF.dbd.CFPh.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhCH.sub.3 n-C.sub. 3 H.sub.7 OPhCF.dbd.CFPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7 C OPhF.dbd.CFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhCH.sub.3 n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhC.sub.2 H.sub.5 n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 C OPhF.dbd.CFPhC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhC.sub. 6 H.sub.13 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhCH.sub.3 n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhC.sub.2 H.sub.5 n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11 P OhCF.dbd.CFPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhCH.sub.3 n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.2 H.sub.5 n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.4 H.sub.9 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhCH.sub.3 n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhC.sub.2 H.sub.5 n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15 P OhCF.dbd.CFPhC.sub.4 H.sub.9 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhCH.sub.3 n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhC.sub.2 H.sub.5 n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) n-C.sub.8 H.sub.17 P OhCF.dbd.CFPhC.sub.4 H.sub.9 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhC.sub.6 H.sub.13 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhC.sub. 10 H.sub.21 (n) n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhCH.sub.3 n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhC.sub.2 H.sub.5 n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) n-C.sub.9 H.sub.19 P OhCF.dbd.CFPhC.sub.4 H.sub.9 (n) n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhC.sub.5 H.sub.11 (n) n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhC.sub.6 H.sub.13 (n) n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhC.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhCH.sub.3 n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhC.sub.2 H.sub.5 n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhC.sub.3 H.sub.7 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhC.sub.4 H.sub.9 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CF PhC.sub.5 H.sub.11 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhC.sub.6 H.sub.13 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhC.sub.7 H.sub.15 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhC.sub.8 H.sub.17 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhC.sub.10 H.sub.21 (n) CH.sub.3 OPhCF.dbd.CFPhOCH.sub.3 (m.p. 143.6.degree. C., c.p. 154.3.degree. C., IR spectrum: shown in FIG. 7) CH.sub.3 OPhCF.dbd.CFPhOC.sub.2 H.sub.5 CH.sub.3 OPhCF.dbd.CFPhOC.sub.3 H.sub.7 (n) CH.sub.3 OPhCF.dbd.CFPhOC.sub.4 H.sub.9 (n) CH.sub.3 OPhCF.dbd.CFPhOC.sub.5 H.sub.11 (n) CH.sub.3 OPhCF.dbd.CFPhOC.sub.6 H.sub.13 (n) CH.sub.3 OPhCF.dbd.CFPhOC.sub.7 H.sub.15 (n) CH.sub.3 OPhCF.dbd.CFPhOC.sub.8 H.sub.17 (n) CH.sub.3 OPhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) CH.sub.3 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.2 H.sub.5 (m.p. 157.5.degree. C., c.p. 173.O.degree. C., IR spectrum: shown in FIG. 8) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhOC.sub.3 H.sub.7 (n) (m.p. 128.5.degree. C., (c.p. 137.5.degree. C., IR spectrum: shown in FIG. 9) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhOC.sub.4 H.sub.9 (n) n-C.sub. 3 H.sub.7 OPhCF.dbd.CFPhOC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhOC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhOC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhOC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhOC.sub.4 H.sub.9 (n) (m.p. 109.3.degree. C., c.p. 146.0.degree. C., IR spectrum: shown in FIG. 10) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhOC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhOC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhOC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhOC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhOC.sub.5 H.sub.11 (n) (m.p. 97.7.degree. C., c.p. 150.3.degree. C., IR spectrum: shown in FIG. 11) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhOC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhOC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhOC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhOC.sub.6 H.sub.13 (n) (m.p. 87.6.degree. C., c.p. 130.2.degree. C., IR spectrum: shown in FIG. 12) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhOC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhOC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhOC.sub. 7 H.sub.15 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhOC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhOC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19PhCF.dbd.CFPhOC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21 OPhCF.dbd.CFPhOC.sub.10 H.sub.21 (n)

The following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene: CH.sub.3PhCClCClPhCN Trans-4-methyl-4'-cyano-.alpha.,.alpha.'-dichlorost ilbene ##STR26## C.sub.2 H.sub.5PhCClCClPhCN n-C.sub.3 H.sub.7PhCClCClPhCN n-C.sub.4 H.sub.9PhCClCClPhCN n-C.sub.5 H.sub.11PhCClCClPhCN n-C.sub.6 H.sub.13PhCClCClPhCN n-C.sub.7 H.sub.15PhCClCClPhCN n-C.sub.8 C H.sub.17PhClCClPhCN n-C.sub.9 H.sub.19PhCClCClPhCN n-C.sub.10 C H.sub.21PhClCClPhCN CH.sub.3PhCClCClPhCH.sub.3 CH.sub.3PhCClCClPhC.sub.2 H.sub.5 CH.sub.3PhCClCClPhC.sub.3 H.sub.7 (n) CH.sub.3PhCClCClPhC.sub.4 H.sub.9 (n) CH.sub.3PhCClCClPhC.sub.5 H.sub.11 (n) CH.sub.3PhCClCClPhC.sub.6 H.sub.13 (n) CH.sub.3Ph CClCClPhC.sub.7 H.sub.15 (n) CH.sub.3PhCClCClPhC.sub.8 H.sub.17 (n) CH.sub.3PhCClCClPhC.sub.9 H.sub.19 (n) CH.sub.3PhCClCClPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5PhCClCClPhC.sub.2 H.sub.5 C.sub.2 H.sub.5PhCClCClPhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5PhCClCClPhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5PhCClCClPhC.sub.5 H.sub.11 (n) C.sub.2 P H.sub.5hCClCClPhC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5PhCClCClPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5PhCClCClPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5PhCClCClPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7 PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9PhCClCClPhC.sub.4 H.sub.9(n) n-C.sub.4 H.sub.9PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.17PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21PhCClCClPhC.sub.10 H.sub.21 (n)

The following compounds can be prepared by changing the raw material of Example 1 or Example 2. CH.sub.3 OPhCCl.dbd.CClPhCN C.sub.2 H.sub.5 OPhCCl.dbd.CClPhCN n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhCN n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhCN n-C.sub.5 H.sub.11 OPhCCl.dbd.CClPhCN n-C.sub.6 H.sub.13 OPhCCl.dbd.CClPhCN n-C.sub.7 H.sub.15 C OPhCCl.dbd.CClPhN n-C.sub.8 H.sub.17 OPhCCl.dbd.CClPhCN n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhCN n-C.sub.10 H.sub.21 OPhCCl.dbd.CClPhCN CH.sub.3 OPhCCl.dbd.CClPhCH.sub.3 CH.sub.3 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 CH.sub.3 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) CH.sub.3 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) CH.sub.3 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) CH.sub.3 OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) CH.sub.3 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) CH.sub.3 OPhCCl.dbd.CClPhC.sub.8 H.sub.17 (n) CH.sub.3 OPhCCl.dbd.CCl PhC.sub.9 H.sub.19 (n) CH.sub.3 OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhCH.sub.3 C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7 C OPhCCl.dbd.CClPhH.sub.3 n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CCl PhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9 C OPhCCl.dbd.CClPhH.sub.3 n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11 OPhCCl.dbd.CClPhCH.sub.3 n-C.sub.5 H.sub.11 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 n-C.sub.5 H.sub.11 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11 C OPhCCl.dbd.CClPh.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11 C OPhCCl.dbd.CClPh.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11 OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11 C OPhCCl.dbd.CClPh.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13 C OPhCCl.dbd.CClPhH.sub.3 n-C.sub.6 H.sub.13 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 n-C.sub.6 H.sub.13 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) n-C.sub.6 H.sub.13 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 C OPhCCl.dbd.CClPh.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13 C OPhCCl.dbd.CClPh.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13 OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13 C OPhCCl.dbd.CClPh.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15 C OPhCCl.dbd.CClPhH.sub.3 n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15 C OPhCCl.dbd.CClPh.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CCl PhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15 C OPhCCl.dbd.CClPh.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17 C OPhCCl.dbd.CClPhH.sub.3 n-C.sub.8 H.sub.17 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 n-C.sub.8 H.sub.17 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) n-C.sub.8 H.sub.17 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) n-C.sub.8 H.sub.17 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.8 H.sub.17 C OPhCCl.dbd.CClPh.sub.6 H.sub.13 (n) n-C.sub.8 H.sub.17 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 C OPhCCl.dbd.CClPh.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17 OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17 C OPhCCl.dbd.CClPh.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19 C OPhCCl.dbd.CClPhH.sub.3 n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 n-C.sub.9 H.sub.19 OPh CCl.dbd.CClPhC.sub.3 H.sub.7 (n) n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) n-C.sub.9 H.sub.19 C OPhCCl.dbd.CClPh.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19 C OPhCCl.dbd.CClPh.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21 OPhCCl.dbd.CClPhCH.sub.3 n-C.sub.10 H.sub.21 OPhCCl.dbd.CClPhC.sub.2 H.sub.5 n-C.sub.10 H.sub.21 OPhCCl.dbd.CClPhC.sub.3 H.sub.7 (n) n-C.sub.10 H.sub.21 OPhCCl.dbd.CClPhC.sub.4 H.sub.9 (n) n-C.sub.10 H.sub.21 OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.10 H.sub.21 OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) n-C.sub.10 H.sub.21 C OPhCCl.dbd.CClPh.sub.7 H.sub.15 (n) n-C.sub.10 H.sub.21 C OPhCCl.dbd.CClPh.sub.8 H.sub.17 (n) n-C.sub.10 H.sub.21 C OPhCCl.dbd.CClPh.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 C OPhCCl.dbd.CClPh.sub.10 H.sub.21 (n) CH.sub.3 OPhCCl.dbd.CClPhOCH.sub.3 CH.sub.3 OPhCCl.dbd.CClPhOC.sub.2 H.sub.5 CH.sub.3 OPhCCl.dbd.CClPhOC.sub.3 H.sub.7 (n) CH.sub.3 OPhCCl.dbd.CClPhOC.sub.4 H.sub.9 (n) CH.sub.3 OPhCCl.dbd.CClPhOC.sub.5 H.sub.11 (n) CH.sub.3 OPhCCl.dbd.CClPhOC.sub.6 H.sub.13 (n) CH.sub.3 OPhCCl.dbd.CClPhOC.sub.7 H.sub.15 (n) CH.sub.3 OPhCCl.dbd.CClPhOC.sub.8 H.sub.17 (n) CH.sub.3 OPhCCl.dbd.CClPhOC.sub.9 H.sub.19 (n) CH.sub.3 OPhCCl.dbd.CClPhOC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.2 H.sub.5 C.sub.2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.2 H.sub.5 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.4 H.sub.9 (n) C.sub. 2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5 OPhCCl.dbd.CClPhOC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhOC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhOC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhOC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7 O OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhOC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7 O OPhCCl.dbd.CClPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7 OPhCCl.dbd.CClPhOC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7 O OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub. 9 OPhCCl.dbd.CClPhOC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhOC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9 O OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhOC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9 O OPhCCl.dbd.CClPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9 OPhCCl.dbd.CClPhOC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9 O OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) n-C.sub.5H.sub.11 O OPhCCl.dbd.CClPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11 O OPhCCl.dbd.CClPhC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11 O OPhCCl.dbd.CClPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11 O OPhCCl.dbd.CClPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11 O OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11 O OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13 OPhCCl.dbd.CClPhOC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13 OPhCCl.dbd.CCl PhOC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13 P OPhCCl.dbd.CClhOC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13 O OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13 O OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhOC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhOC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhOC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15 OPhCCl.dbd.CClPhOC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17 P OPhCCl.dbd.CClhOC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17 O OPhCCl.dbd.CClPhC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17 O OPhCCl.dbd.CClPhC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhOC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19 OPhCCl.dbd.CClPhOC.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21 OPhCCl.dbd.CClPhOC.sub.10 H.sub.21 (n)

The following compounds can be prepared by changing the raw material of Example 1 or Example 2. In the following formulas, Ph represents a phenylene group ##STR27## and PhF represents a fluorine-substituted phenylene group ##STR28##

Further, the following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene.

The following compounds can be prepared by changing the raw material of Example 1 or Example 2. In the following formulas, Cy--Ph and Ph--Cy represent p-(trans-4-substituted cyclohexyl)phenylene groups which have the following structures: ##STR30##

Further, the following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene. CH.sub.3CyPhCClCClPhCyCH.sub.3 Trans-4,4'-bis-(4-methyl-trans-cyclohexyl )-.alpha., .alpha.'-dichlorostilbene ##STR31## CH.sub.3CyPhCClCClPhCyC.sub.2 H.sub.5 CH.sub.3CyPhCClCClPhCyC.sub.3 H.sub.7 (n) CH.sub.3CyPhCClCClPhCyC.sub.4 H.sub.9 (n) CH.sub.3CyPhCClCClPhCyC.sub.5 H.sub.11 (n) CH.sub.3CyPhCClCClPhCyC.sub.6 H.sub.13 (n) CH.sub.3CyPhCClCClPhCyC.sub.7 H.sub.15 (n) CH.sub.3CyPhCClCClPhCyC.sub.8 H.sub.17 (n) CH.sub.3CyPhCClCClPhCyC.sub.9 H.sub.19 (n) CH.sub.3CyPhCClCClPhCyC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5CyPhCClCClPh CyC.sub.2 H.sub.5 C.sub.2 H.sub.5CyPhCClCClPhCyC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5CyPhCClCClPhCyC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5CyPhCClCClPhCyC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5CyPhCClCClPhCyC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5CyPhCClCClPhCyC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5CyPhCClCClPhCyC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5CyPhCClCClPhCyC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5CyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.3 C H.sub.7CyPhCClCClPhyC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7CyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyPhCClCClPhCy.sub.5 H.sub.11 (n) n-C.sub.3 C H.sub.7CyPhCClCClPhCy.sub.6 H.sub.13 (n) n-C.sub.3 C H.sub.7CyPhCClCClphCy.sub.7 H.sub.15 (n) n-C.sub.3 C H.sub.7CyPhCClCClPhCy.sub.8 H.sub.17 (n) n-C.sub.3 C H.sub.7CyPhCClCClPhCy.sub.9 H.sub.19 (n) n-C.sub.3 C H.sub.7CyPhCClCClPhCy.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9CyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.4 C H.sub.9CyPhCClCClPhCy.sub.5 H.sub.11 (n) n-C.sub.4 C H.sub.9CyPhCClCClPhCy.sub.6 H.sub.13 (n) n-C.sub.4 C H.sub.9CyPhCClCClPhCy.sub.7 H.sub.15 (n) n-C.sub.4 C H.sub.9CyPhCClCClPhCy.sub.8 H.sub.17 (n) n-C.sub.4 C H.sub.9CyPhCClCClPhCy.sub.9 H.sub.19 (n) n-C.sub.4 C H.sub.9CyPhCClCClPhCy.sub.10 H.sub.21 (n) n-C.sub.5 C H.sub.11CyPhCClCClPhyC.sub.5 H.sub.11 (n) n-C.sub.5 C H.sub.11CyPhCClCClPhyC.sub.6 H.sub.13 (n) n-C.sub.5 C H.sub.11CyPhCClCClPhyC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11Cy PhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.5 P H.sub.11CyPhCClCClhCyC.sub.9 H.sub.19 (n) n-C.sub.5 C H.sub.11CyPhCClCClPhyC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13CyPhCClCClPhCyC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13CyPhCClCClPhCyC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13CyPhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13CyPhCClCClPhCyC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13CyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.7 P H.sub.15CyPhCClCClhCyC.sub.7 H.sub.15 (n) n-C.sub.7 C H.sub.15CyPhCClCClPhyC.sub.8 H.sub.17 (n) n-C.sub.7 C H.sub.15CyPhCClCClPhyC.sub.9 H.sub.19 (n) n-C.sub.7 C H.sub.15CyPhCClCClPhyC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17CyPhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17CyPhCClCClPhCy C.sub.9 H.sub.19 (n) n-C.sub.8 P H.sub.17CyPhCClCClhCyC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19CyPhCClCClPhCyC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19CyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21CyPhCClCClPhCyC.sub.10 H.sub.21 (n) CH.sub.3 OCyPhCClCClPhCyCH.sub.3 CH.sub.3 OCyPhCClCClPhCyC.sub.2 H.sub.5 CH.sub.3 OCyPhCClCClPhCyC.sub.3 H.sub.7 (n) CH.sub.3 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) CH.sub.3 OCyPhCClCClPhCyC.sub.5 H.sub.11 (n) CH.sub.3 OCyPhCClCClPhCyC.sub.6 H.sub.13 (n) CH.sub.3 OCyPhCClCClPhCyC.sub.7 H.sub.15 (n) CH.sub.3 OCyPhCClCClPhCyC.sub.8 H.sub.17 (n) CH.sub.3 OCyPhCClCClPhCyC.sub.9 H.sub.19 (n) CH.sub.3 OCyPhCClCClPhCyC.sub.10 H.sub. 21 (n) C.sub.2 H.sub.5 OCyPhCClCClPhCyCH.sub.3 C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.2 H.sub.5 C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5 OCyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7 OCyPhCClCClPhCyCH.sub.3 n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.3 H.sub. 7 (n) n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7 OCyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9 OCyPhCClCClPhCyCH.sub.3 n-C.sub.4 H.sub.9 OCyPhCClCClPhCyC.sub.2 H.sub.5 n-C.sub.4 H.sub.9 OCyPhCClCClPhCyC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9 OCyPhCClCClPhCyC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9 OCyPhCClCClPh CyC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9 OCyPhCClCClPhCyC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9CyPhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9 OCyPhCClCClPhCyC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9 OCyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11 OCyPhCClCClPhCyCH.sub.3 n-C.sub.5 H.sub.11 OCyPhCClCClPhCyC.sub.2 H.sub.5 n-C.sub.5 H.sub.11 OCyPhCClCClPhCyC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 OCyPhCClCClPhCyC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11 OCyPhCClCClPhCyC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11 OCyPhCClCClPhCyC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11 OCyPhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11 OCyPh CClCClPhCyC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11 OCyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhCyCH.sub.3 n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.2 H.sub.5 n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhCyCH.sub.3 n-C.sub.7 H.sub.15 OCy PhCClCClPhCyC.sub.2 H.sub.5 n-C.sub.7 H.sub.15 OCyPhCClCClPhCyC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhCyC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhCyC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhCyC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhCyC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhCyCH.sub.3 n-C.sub.8 H.sub.17 OCyPhCClCClPhCyC.sub.2 H.sub.5 n-C.sub.8 H.sub.17 OCyPhCClCClPhCyC.sub.3 H.sub.7 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.8 H.sub. 17 OCyPhCClCClPhCyC.sub.5 H.sub.11 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhCyC.sub.6 H.sub.13 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhCyC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhCyC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhCyC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhCyC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19 OCyPhCClCClPhCyCH.sub.3 n-C.sub.9 H.sub.19 OCyPhCClCClPhCyC.sub.2 H.sub.5 n-C.sub.9 H.sub.19 OCyPhCClCClPhCyC.sub.3 H.sub.7 (n) n-C.sub.9 H.sub.19 OCyPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.9 H.sub.19 OCyPhCClCClPhCyC.sub.5 H.sub.11 (n) n-C.sub.9 H.sub.19 OCyPhCClCClPhCyC.sub.6 H.sub.13 ##STR32##

The following compounds can be prepared by changing the raw material of Example 1 or Example 2: CH.sub.3CyPhCFCFPhCN Trans-4-(4-methyl-trans-cyclohexyl)-4'-cyano-.alpha .'-difluorostilbene ##STR33## C.sub.2 H.sub.5CyPhCFCFPhCN n-C.sub.3 H.sub.7CyPhCFCFPhCN n-C.sub.4 H.sub.9CyPhCFCFPhCN n-C.sub.5 H.sub.11CyPhCFCFPhCN n-C.sub.6 C H.sub.13CyPhFCFPhCN n-C.sub.7 H.sub.15CyPhCFCFPhCN n-C.sub.8 H.sub.17CyPhCFCFPhCN n-C.sub.9 H.sub.19CyPhCFCFPhCN n-C.sub.10 H.sub.21CyPhCFCFPhCN CH.sub.3CyPhCFCFPhCH.sub.3 CH.sub.3CyPhCFCFPhC.sub. 2 H.sub.5 CH.sub.3CyPhCFCFPhC.sub.3 H.sub.7 (n) CH.sub.3CyPhCFCFPhC.sub.4 H.sub.9 (n) CH.sub.3Cy PhCFCFPhC.sub.5 H.sub.11 (n) CH.sub.3CyPhCFCFPhC.sub.6 H.sub.13 (n) CH.sub.3CyPhCFCFPhC.sub.7 H.sub.15 (n) CH.sub.3CyPhCFCFPhC.sub.8 H.sub.17 (n) CH.sub.3CyPhCFCFPhC.sub.9 H.sub.19 (n) CH.sub.3CyPhCFCFPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5CyPhCFCFPhCH.sub.3 C.sub.2 H.sub.5CyPhCFCFPhC.sub.2 H.sub.5 C.sub.2 H.sub.5CyPhCFCFPhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5CyPhCFCFPhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5CyPhCFCFPhC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5CyPhCFCFPhC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5CyPhCFCFPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5CyPhCFCFPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5CyPhCFCFPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5CyPhCFCFPh C.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7CyPhCFCFPhCH.sub.3 n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7CyPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9CyPhCFCFPhCH.sub.3 n-C.sub.4 H.sub.9CyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.4 H.sub.9CyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9CyPhCF CFPhC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9CyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9CyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9CyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9CyPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9CyPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11CyPhCFCFPhCH.sub.3 n-C.sub.5 H.sub.11CyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.5 H.sub.11CyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11CyPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11CyPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11CyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11CyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11CyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11CyPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub. 5 H.sub.11CyPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13CyPhCFCFPhCH.sub.3 n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13CyPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15CyPhCFCFPhCH.sub.3 n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15CyPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17CyPhCFCFPhCH.sub.3 n-C.sub.8 H.sub.17CyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.8 H.sub.17CyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.8 H.sub.17CyPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.8 H.sub.17CyPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.8 H.sub.17CyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.8 H.sub.17CyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17CyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17CyPhCF CFPhC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17CyPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19CyPhCFCFPhCH.sub.3 n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19CyPhCFCFPhCH.sub.3 n-C.sub.9 H.sub.19CyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.10 H.sub.21CyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.10 C H.sub.21Cy PhFCFPhC.sub.4 H.sub.9 (n) n-C.sub.10 H.sub.21CyPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.10 H.sub.21CyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.10 H.sub.21CyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.10 H.sub.21CyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.10 H.sub.21CyPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21CyPhCFCFPhC.sub.10 H.sub.21 (n) CH.sub.3 OCyPhCFCFPhCN C.sub.2 H.sub.5 OCyPhCFCFPhCN n-C.sub.3 H.sub.7 OCyPhCFCFPhCN n-C.sub.4 H.sub.9 C OyPhCFCFPhCN n-C.sub.5 H.sub.11 OCyPhCFCFPhCN n-C.sub.6 H.sub.13 OCyPhCFCFPhCN n-C.sub.7 H.sub.15 OCyPhCFCFPhCN n-C.sub.8 H.sub.17 C OCyPhCFFPhCN n-C.sub.9 H.sub.19CyPhCFCFPhCN n-C.sub.10 H.sub.21 P OCyPhCFCFhCN CH.sub.3 OCyPhCFCFPhCH.sub.3 C.sub.2 H.sub.5 OCyPhCFCFPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OCyPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OCyPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 C OyPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OCyPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OCyPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OCyPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OCyPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OCyPhCFCFPhC.sub.10 H.sub.21 (n) CH.sub.3 OCyPhCFCFPhOCH.sub.3 C.sub.2 H.sub.5 OCyPhCFCFPhOC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OCyPhCFCFPhOC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OCyPhCFCFPhOC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 OCyPhCFCFPhOC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OCyPhCFCFPhOC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OCyPhCFCFPhOC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OCyPhCFCFPhOC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OCyPhCFCFPhOC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OCyPhCFCFPhOC.sub.10 H.sub.21 (n)

Further, the following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene. CH.sub.3CyPhCClCClPhCN Trans-4-(4-methyl-trans-cyclohexyl)-'-cyano-.alph a., .alpha.'-dichlorostilbene ##STR34## C.sub.2 H.sub.5CyPhCClCClPhCN n-C.sub.3 H.sub.7CyPhCClCClPhCN n-C.sub.4 H.sub.9CyPhCClCClPhCN n-C.sub.5 C H.sub.11yPhCClCClPhCN n-C.sub.6 H.sub.13CyPhCClCClPhCN n-C.sub.7 C H.sub.15yPhCClCClPhCN n-C.sub.8 H.sub.17CyPhCClCClPhCN n-C.sub.9 C H.sub.19yPhCClCClPhCN n-C.sub.10 H.sub.21CyPhCClCClPhCN CH.sub.3CyPhCClCClPhCH.sub.3 CH.sub.3CyPhCClCClPhC .sub.2 H.sub.5 CH.sub.3CyPhCClCClPhC.sub.3 H.sub.7 P (n) CH.sub.3CyPhCClCClhC.sub.4 H.sub.9 (n) CH.sub. 3CyPhCClCClPhC.sub.5 H.sub.11 (n) CH.sub.3CyPhCClCClPhC.sub.6 H.sub.13 (n) CH.sub.3CyPhCClCClPhC.sub.7 H.sub.15 (n) CH.sub.3CyPhCClCClPhC.sub.8 H.sub.17 (n) CH.sub.3CyPhCClCClPhC.sub.9 H.sub.19 (n) CH.sub.3CyPhCClCClPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5CyPhCClCClPhCH.sub.3 C.sub.2 H.sub.5CyPhCClCClPhC.sub.2 H.sub.5 C.sub.2 H.sub.5CyPhCClCClPhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5CyPhCClCClPhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5CyPhCClCClPhC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5CyPhCClCClPhC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5CyPhCClCClPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5CyPhCClCClPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5CyPhCClCClPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5CyPhCCl CClPhC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7CyPhCClCClPhCH.sub.3 n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7CyPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9CyPhCClCClPhCH.sub.3 n-C.sub.4 H.sub.9CyPhCClCClPhC.sub.2 H.sub.5 n-C.sub.4 H.sub.9CyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9Cy PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9CyPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9CyPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9CyPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9CyPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9CyPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11CyPhCClCClPhCH.sub.3 n-C.sub.5 H.sub.11CyPhCClCClPhC.sub.2 H.sub.5 n-C.sub.5 H.sub.11CyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11CyPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11CyPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11CyPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11CyPhCClCClPhC.sub.7 H.sub.15, (n) n-C.sub.5 C H.sub.11CyPhCClCClPh.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11CyPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11CyPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.6 C H.sub.13CyPhCClCClPhH.sub.3 n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.2 H.sub.5 n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.4 H.sub.5 (n) n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13CyPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.7 C H.sub.15CyPhCClCClPhH.sub.3 n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.2 H.sub.5 n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15CyPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.8 C H.sub.17CyPhCClCClPhH.sub.3 n-C.sub.8 H.sub.17CyPhCClCClPhC.sub.2 H.sub.5 n-C.sub.8 H.sub.17CyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.8 H.sub.17CyPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.8 H.sub.17CyPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.8 H.sub.17CyPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.8 H.sub.17CyPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17CyPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.8 C H.sub.17Cy PhCClCClPh.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17CyPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.9 C H.sub.19CyPhCClCClPhH.sub.3 n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.2 H.sub.5 n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.9 C H.sub.19CyPhCClCClPhH.sub.3 n-C.sub.9 H.sub.19CyPhCClCClPhC.sub.2 H.sub.5 n-C.sub.10 H.sub.21CyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.10 H.sub. 21CyPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.10 H.sub.21CyPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.10 C H.sub.21CyPhCClCClPh.sub.6 H.sub.13 (n) n-C.sub.10 H.sub.21CyPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.10 C H.sub.21CyPhCClCClPh.sub.8 H.sub.17 (n) n-C.sub.10 H.sub.21CyPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.10 C H.sub.21CyPhCClCClPh.sub.10 H.sub.21 (n) CH.sub.3 OCyPhCClCClPhCN C.sub.2 H.sub.5 OCyPhCClCClPhCN n-C.sub.3 H.sub.7 OCyPhCClCClPhCN n-C.sub.4 H.sub.9 OCyPhCClCClPhCN n-C.sub.5 H.sub.11 OCyPhCClCClPhCN n-C.sub.6 H.sub.13 OCyPhCClCClPhCN n-C.sub.7 H.sub.15 OCyPhCClCClPhCN n-C.sub.8 H.sub.17 OCyPhCClCClPhCN n-C.sub.9 H.sub.19 OCyPhCClCClPhCN n-C.sub.10 H.sub.21 OCyPhCCl CClPhCN CH.sub.3 OCyPhCClCClPhCH.sub.3 C.sub.2 H.sub.5 OCyPhCClCClPhC,H.sub.5 n-C.sub.3 H.sub.7 OCyPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OCyPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 OCyPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 C OyPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OCyPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OCyPhCClCClPhC.sub.10 H.sub.21 (n) CH.sub.3 OCyPhCClCClPhOCH.sub.3 C.sub.2 H.sub.5 OCyPhCClCClPhOC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OCyPhCClCClPhOC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 P OCyhCClCClPhOC.sub.4 H.sub.9 (n) n-C.sub. 5 H.sub.11 OCyPhCClCClPhOC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OCyPhCClCClPhOC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OCyPhCClCClPhOC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OCyPhCClCClPhOC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OCyPhCClCClPhOC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OCyPhCClCClPhOC.sub.10 H.sub.21 (n)

The following compounds can be prepared by changing the raw material of Example 1 or Example 2. In the following formulas, Ph and PhF represent the phenylene group and the fluorine-substituted phenylene group as mentioned above.

Further, the following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene.

The following compounds can be prepared by changing the raw material of Example 1 or Example 2: CH.sub.3PhPhCFCFPhCN Trans-4-(4-methylphenyl)-4'-cyano-.alpha.,.alpha.'- difluorostilbene ##STR37## C.sub.2 H.sub.5PhPhCFCFPhCN n-C.sub.3 H.sub.7PhPhCFCFPhCN n-C.sub.4 H.sub.9PhPhCFCFPhCN n-C.sub.5 H.sub.11PhPhCFCFPhCN n-C.sub.6 C H.sub.13PhPhFCFPhCN n-C.sub.7 H.sub.15PhPhCFCFPhCN n-C.sub.8 H.sub.17PhPhCFCFPhCN n-C.sub.9 H.sub.19PhPhCFCFPhCN n-C.sub.10 H.sub.21PhPhCFCFPhCN CH.sub.3PhPhCFCFPhCH.sub.3 CH.sub.3PhPhCFCFPhC.sub. 2 H.sub.5 CH.sub.3PhPhCFCFPhC.sub.3 H.sub.7 (n) CH.sub.3PhPhCFCFPhC.sub.4 H.sub.9 (n) CH.sub.3PhPhCF CFPhC.sub.5 H.sub.11 (n) CH.sub.3PhPhCFCFPhC.sub.6 H.sub.13 (n) CH.sub.3PhPhCFCFPhC.sub.7 H.sub.15 (n) CH.sub.3PhPhCFCFPhC.sub.8 H.sub.17 (n) CH.sub.3PhPhCFCFPhC.sub.9 H.sub.19 (n) CH.sub.3PhPhCFCFPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5PhPhCFCFPhCH.sub.3 C.sub.2 H.sub.5PhPhCFCFPhC.sub.2 H.sub.5 C.sub.2 H.sub.5PhPhCFCFPhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5PhPhCFCFPhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5PhPhCFCFPhC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5PhPhCFCFPhC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5PhPhCFCFPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5PhPhCFCFPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5PhPhCFCFPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5PhPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7PhPhCFCFPhCH.sub.3 n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7PhPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9PhPhCFCFPhCH.sub.3 n-C.sub.4 H.sub.9PhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.4 H.sub.9PhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9PhPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9PhPhCFCFPh C.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9PhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9PhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9PhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9PhPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9PhPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11PhPhCFCFPhCH.sub.3 n-C.sub.5 H.sub.11PhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.5 H.sub.11PhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11PhPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11PhPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11PhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11PhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11PhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11PhPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub. 11PhPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13PhPhCFCFPhCH.sub.3 n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13PhPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15PhPhCFCFPhCH.sub.3 n-C.sub.7 H.sub.15PhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.7 H.sub.15PhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15PhPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub. 7 H.sub.15PhPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15PhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15PhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15PhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15PhPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15PhPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17PhPhCFCFPhCH.sub.3 n-C.sub.8 H.sub.17PhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.8 H.sub.17PhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.8 H.sub.17PhPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.8 H.sub.17PhPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.8 H.sub.17PhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.8 H.sub.17PhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17PhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17PhPhCFCFPh C.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17PhPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19PhPhCFCFPhCH.sub.3 n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19PhPhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21PhPhCFCFPhCH.sub.3 n-C.sub.10 H.sub.21PhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.10 H.sub.21PhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.10 H.sub.21PhPhCF CFPhC.sub.4 H.sub.9 (n) n-C.sub.10 H.sub.21PhPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.10 H.sub.21PhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.10 H.sub.21PhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.10 H.sub.21PhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.10 H.sub.21PhPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21PhPhCFCFPhC.sub.10 H.sub.21 (n) CH.sub.3 OPhPhCFCFPhCN C.sub.2 H.sub.5 OPhPhCFCFPhCN n-C.sub.3 H.sub.7 OPhPhCFCFPhCN n-C.sub.4 H.sub.9 P OhPhCFCFPhCN n-C.sub.5 H.sub.11 OPhPhCFCFPhCN n-C.sub.6 H.sub.13 OPhPhCFCFPhCN n-C.sub.7 H.sub.15 OPhPhCFCFPhCN n-C.sub.8 H.sub.17 C OPhPhCFFPhCN n-C.sub.9 H.sub.19 OPhPhCFCFPhCN n-C.sub.10 H.sub.21 C OPhPhCFFPhCN CH.sub. 3 OPhPhCFCFPhCH.sub.3 C.sub.2 H.sub.5 OPhPhCFCFPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OPhPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OPhPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 P OhPhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OPhPhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OPhPhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OPhPhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OPhPhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OPhPhCFCFPhC.sub.10 H.sub.21 (n) CH.sub.3 OPhPhCFCFPhOCH.sub.3 C.sub.2 H.sub.5 OPhPhCFCFPhOC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OPhPhCFCFPhOC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OPhPhCFCFPhOC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub. 11 OPhPhCFCFPhOC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OPhPhCFCFPhOC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OPhPhCFCFPhOC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OPhPhCFCFPhOC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OPhPhCFCFPhOC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OPhPhCFCFPhOC.sub.10 H.sub.21 (n)

Further, the following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene. CH.sub.3PhPhCClCClPhCN Trans-4-(4-methylphenyl)-4'-cyano-.alpha.,.alpha. '-dichlorostilbene ##STR38## C.sub.2 H.sub.5PhPhCClCClPhCN n-C.sub.3 H.sub.7PhPhCClCClPhCN n-C.sub.4 H.sub.9PhPhCClCClPhCN n-C.sub.5 P H.sub.11hPhCClCClPhCN n-C.sub.6 H.sub.13PhPhCClCClPhCN n-C.sub.7 P H.sub.15hPhCClCClPhCN n-C.sub.8 H.sub.17PhPhCClCClPhCN n-C.sub.9 P H.sub.19hPhCClCClPhCN n-C.sub.10 H.sub.21PhPhCClCClPhCN CH.sub.3PhPhCClCClPhCH.sub.3 CH.sub.3PhPhCClCClPhC .sub.2 H.sub.5 CH.sub.3PhPhCClCClPhC.sub.3 H.sub.7 P (n) CH.sub.3PhPhCClCClhC.sub.4 H.sub.9 (n) CH.sub.3PhPhCCl CClPhC.sub.5 H.sub.11 (n) CH.sub.3PhPhCClCClPhC.sub.6 H.sub.13 (n) CH.sub.3PhPhCClCClPhC.sub.7 H.sub.15 (n) CH.sub.3PhPhCClCClPhC.sub.8 H.sub.17 (n) CH.sub.3PhPhCClCClPhC.sub.9 H.sub.19 (n) CH.sub.3PhPhCClCClPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5PhPhCClCClPhCH.sub.3 C.sub.2 H.sub.5 PhPhCClCClPhC.sub.2 H.sub.5 C.sub.2 H.sub.5PhPhCClCClPhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5 P PhPhCClCClhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5PhPhCClCClPhC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5 PhPhCClCClPhC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5PhPhCClCClPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5 PhPhCClCClPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5PhPhCClCClPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5 PhPh CClCClPhC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7PhPhCClCClPhCH.sub.3 n-C.sub.3 H.sub.7 C PhPhCClCClPh.sub.2 H.sub.5 n-C.sub.3 H.sub.7PhPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7 PhPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 P H.sub.7PhhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7 PhPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7PhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7 PhPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7PhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7 P hPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9PhPhCClCClPhCH.sub.3 n-C.sub.4 H.sub.9 PhPhCClCClPhC.sub.2 H.sub.5 n-C.sub.4 P H.sub.9PhPhCClCClhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 PhPh CClCClPhC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9PhPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9 PhPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9PhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9 P hPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9PhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9 PhPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11PhPhCClCClPhCH.sub.3 n-C.sub.5 H.sub.11 PhPhCClCClPhC.sub.2 H.sub.5 n-C.sub.5 H.sub.11PhPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11 PhPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11PhPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11 PhPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11PhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11 PhPhCCl CClPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11PhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11 PhPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13PhPhCClCClPhCH.sub.3 n-C.sub.6 H.sub.13 PhPhCClCClPhC.sub.2 H.sub.5 n-C.sub.6 H.sub.13PhPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13 PhPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.6 H.sub.13PhPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 PhPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13PhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13 PhPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13PhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13 PhPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15PhPhCClCClPhCH.sub.3 n-C.sub.7 H.sub.15 PhPhCClCClPhC.sub.2 H.sub.5 n-C.sub.7 H.sub.15PhPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15 PhPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.7 H.sub.15PhPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15 PhPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15PhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15 PhPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15PhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15 PhPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17PhPhCClCClPhCH.sub.3 n-C.sub.8 H.sub.17 PhPhCClCClPhC.sub.2 H.sub.5 n-C.sub.8 H.sub.17PhPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.8 H.sub.17 PhPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.8 H.sub.17PhPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.8 H.sub.17 PhPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.8 H.sub.17PhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 PhPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17PhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17 PhPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19PhPhCClCClPhCH.sub.3 n-C.sub.9 H.sub.19 PhPhCClCClPhC.sub.2 H.sub.5 n-C.sub.9 H.sub.19PhPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.9 H.sub.19 PhPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.9 H.sub.19PhPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.9 H.sub.19 PhPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.9 H.sub.19PhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.9 H.sub.19 PhPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19PhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19 PhPhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21PhPhCClCClPhCH.sub.3 n-C.sub.10 H.sub.21 PhPhCClCClPhC.sub.2 H.sub.5 n-C.sub.10 H.sub.21PhPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.10 H.sub.21 PhPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.10 H.sub.21PhPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.10 H.sub.21 PhPhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.10 H.sub.21PhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.10 H.sub.21 PhPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.10 H.sub.21PhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 PhPhCClCClPhC.sub.10 H.sub.21 (n) CH.sub.3 OPhPhCClCClPhCN C.sub.2 H.sub.5 OPhPhCClCClPhCN n-C.sub.3 H.sub.7 OPhPhCClCClPhCN n-C.sub.4 H.sub.9 OPhPhCClCClPhCN n-C.sub.5 H.sub.11 OPhPhCClCClPhCN n-C.sub.6 H.sub.13 O PhPhCClCClPhCN n-C.sub.7 H.sub.15 OPhPhCClCClPhCN n-C.sub.8 H.sub.17 OPhPhCClCClPhCN n-C.sub.9 H.sub.19 OPhPhCClCClPhCN n-C.sub.10 H.sub.21 OPhPhCClCClPhCN CH.sub.3 OPhPhCClCClPhCH.sub.3 C.sub.2 H.sub.5 P OhPhCClCClPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OPhPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OPhPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 OPhPhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 P OPhPhCClCClhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OPhPhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OPhPhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OPhPhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OPhPhCClCClPhC.sub.10 H.sub.21 (n) CH.sub.3 OPhPhCCl CClPhOCH.sub.3 C.sub.2 H.sub.5 OPhPhCClCClPhOC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OPhPhCClCClPhOC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OPhPhCClCClPhOC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 OPhPhCClCClPhOC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OPhPhCClCClPhOC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OPhPhCClCClPhOC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OPhPhCClCClPhOC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OPhPhCClCClPhOC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OPhPhCClCClPhOC.sub.10 H.sub.21 (n)

The following compounds can be prepared by changing the raw material of Example 1 or Example 2:

Further, the following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene.

The following compounds can be prepared by changing the raw material of Example 1 or Example 2: CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhCN Trans-4-[2-(4-methyl-trans-cyclohexyl)ethyl]-4'-cyano -.alpha.,.alpha.'-difluorostilbene ##STR41## C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhCN n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCFCFPhCN n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCFCFPhCN n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhCN n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCFCFPhCN n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCFCFPhCN n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCFCFPhCN n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCFCFPhCN n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCF CFPhCN CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.3 CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.2 H.sub.5 CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.3 H.sub.7 C (n) CH.sub.3CyH.sub.2 CH.sub.2PhCFCFPhC.sub.4 H.sub.9 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.5 H.sub.11 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.6 H.sub.13 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.7 H.sub.15 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.8 H.sub.17 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.9 H.sub.19 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.3 C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.2 H.sub.5 C.sub.2 H.sub.5CyCH.sub.2 P CH.sub.2 PhCFCFhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5CyCH.sub.2 C CH.sub.2PhFCFPhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.3 n-C.sub.3 H.sub.7 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7CyCH.sub.2 C CH.sub.2PhCFFPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7 CyCH.sub.2 P CH.sub.2hCFCFPh C.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7 CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.3 n-C.sub.4 H.sub.9 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.2 H.sub.5 n-C.sub.4 H.sub.9CyCH.sub.2 C CH.sub.2PhCFFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9CyCH.sub.2 C CH.sub.2PhFCFPhC.sub. 5 H.sub.11 (n) n-C.sub.4 H.sub.9 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9 CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.3 n-C.sub.5 H.sub.11 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.2 H.sub.5 n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub. 6 H.sub.13 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.3 n-C.sub.6 H.sub.13 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.2 H.sub.5 n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.6 H.sub.13CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.7 H.sub. 15 (n) n-C.sub.6 H.sub.13 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.3 n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.2 H.sub.5 n-C.sub.7 H.sub.15 CyCH.sub.2 C CH.sub.2PhFCFPhC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.7 H.sub.15 CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15CyCH.sub.2 P CH.sub.2hCFCFPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.3 n-C.sub.8 H.sub.17 CyCH.sub.2 CH.sub.2PhCFCFPhC.sub.2 ##STR42##

Further, the following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene. CH.sub.3CyCH.sub.2 CH.sub.2PhCClCClPhCN Trans-4-[2-(4-methyl-trans-cyclohexyl)ethyl]-4'-cya no-.alpha.,.alpha.'-dichlorostilbene ##STR43## C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCCl CClPhCN CH.sub.3CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 CH.sub.3CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 CH.sub.3CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) C CH.sub.3yCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 C (n) CH.sub.3CyH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 C (n) CH.sub.3CyH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) CH.sub.3CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 C (n) CH.sub.3CyH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 C.sub.2 H.sub.5 CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 C.sub.2 H.sub.5CyCH.sub.2 CH.sub. 2PhCClCClPhC.sub.3 H.sub.7 (n) C.sub.2 H.sub.5 CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) C.sub.2 H.sub.5CyCH.sub.2 P CH.sub.2hCClCClPhC.sub.5 H.sub.11 (n) C.sub.2 H.sub.5 CyCH.sub.2 P CH.sub.2hCClCClPhC.sub.6 H.sub.13 (n) C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) C.sub.2 H.sub.5 CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) C.sub.2 H.sub.5CyCH.sub.2 P CH.sub.2hCClCClPhC.sub.9 H.sub.19 (n) C.sub.2 H.sub.5 CyCH.sub.2 P CH.sub.2hCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 n-C.sub.3 H.sub.7 CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7CyCH.sub.2 C CH.sub.2PhClCClPhC.sub.3 H.sub.7 (n) n-C.sub.3 H.sub.7 CyCH.sub.2 CH.sub. 2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 n-C.sub.4 H.sub.9 CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 n-C.sub.4 H.sub.9CyCH.sub.2 C CH.sub.2PhClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCClCCl PhC.sub.5 H.sub.11 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.6 H.sub.13CyCH.sub. 2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCCl PhC.sub.9 H.sub.19 (n) n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.8 H.sub.17CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.9 H.sub.19CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2 PhCClCClPhC.sub.2 H.sub.5 n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21CyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n) CH.sub.3 OCyCH.sub.2 CH.sub.2PhCClCClPhCN C.sub.2 H.sub.5 OCyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.3 H.sub.7 OCyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.4 H.sub.9 OCyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.5 H.sub.11 OCyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.6 H.sub.13 OCyCH.sub.2 P CH.sub.2hCClCClPhCN n-C.sub.7 H.sub.15 OCyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.8 H.sub.17 OCyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.9 H.sub.19 OCyCH.sub.2 CH.sub.2PhCClCClPhCN n-C.sub.10 H.sub.21 OCyCH.sub.2 P CH.sub.2hCClCClPhCN CH.sub.3 OCyCH.sub.2 CH.sub.2PhCClCClPhCH.sub.3 C.sub.2 H.sub.5 OCyCH.sub.2 CH.sub.2PhCClCClPhC.sub.2 H.sub.5 n-C.sub.3 H.sub.7 OCyCH.sub.2 CH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9 OCyCH.sub.2 CH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.5 H.sub.11 OCyCH.sub.2 CH.sub.2PhCClCClPhC.sub.5 H.sub.11 (n) n-C.sub.6 H.sub.13 OCyCH.sub.2 CH.sub.2PhCClCClPhC.sub.6 H.sub.13 (n) n-C.sub.7 H.sub.15 OCyCH.sub.2 CH.sub.2 PhCClCClPhC.sub.7 H.sub.15 (n) n-C.sub.8 H.sub.17 OCyCH.sub.2 CH.sub.2PhCClCClPhC.sub.8 H.sub.17 (n) n-C.sub.9 H.sub.19 OCyCH.sub.2 CH.sub.2PhCClCClPhC.sub.9 H.sub.19 (n) n-C.sub.10 H.sub.21 OCyCH.sub.2 CH.sub.2PhCClCClPhC.sub.10 H.sub.21 (n)

The following compounds can be prepared by changing the raw material of Example 1 or Example 2:

Further, the following compounds can be prepared by changing tetrafluoroethylene to tetrachloroethylene.

Further, in the same manner, the following compounds can be prepared.

In 1 l of four-necked flask, 178 g (0.81 mol) of p-iodophenol, 81.68 g of dihydropyran and hexane were introduced and stirred for one hour. Then, 15 g of a cation exchange resin Amberlyst 15 (Rohm & Haas Co. "Amberlyst".RTM.) was added thereto and stirred at room temperature overnight. Amberlyst 15 was removed by filtration and the filtrate was washed with an alkali and then with water. The oil layer was dried over sodium hydroxide and the solvent was distilled off to obtain 189.7 g (yield: 77%) of 4-[(tetrahydropyran-2-yl)oxy]iodobenzene.

In the same manner as in Example 1, 17.2 g (0.086 mol) of 1-(4-n-propylphenyl)-1,2,2-trifluoroethylene was prepared from p-n-propyliodobenzene. Then, 26.15 g (0.086 mol) of 4-[(tetrahydropyran-2-yl)oxy]iodobenzene was reacted thereto instead of p-n-propyliodobenzene used in Example 1 to obtain 21.6 g (yield:70%) of trans-{[(4-tetrahydropyran-2-yl)oxy]-4'-n-propyl}difluorostilbene.

The reaction solution was refluxed in 2N hydrochloric acid for one hour to obtain 11.5 g (yield: 70%) of trans-4-hydroxy-4'-n-propyl)difluorostilbene.

Then, 11.5 g of trans-(4-hydroxy-4'-n-propyl)difluorostilbene thus obtained was dissolved in 30 ml of methylene chloride and 3.3 g of pyridine was added thereto at room temperature. The mixture was cooled to 0.degree. C. and 6.5 g of p-toluoyl chloride was dropwise added thereto. The mixture was stirred at room temperature for one hour and cooled, and then diluted hydrochloric acid was added thereto, followed by filtration. The solvent was distilled off and a crude crystal thus obtained was purified by silica gel column chromotography to obtain 15.5 g (yield: 94%) of trans[4-(4"-methylbenzoyloxy)-4'-n-propyl]difluorostilbene.

The analytical result of the compound are as follows:

MS m/e 392 (M.sup.+)

In the same manner as in Example 1, 2 or 3, the following compounds are synthesized: n-C.sub.3 H.sub.7PhCOOPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 P H.sub.9PhCOOhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7PhCOOPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 P H.sub.9PhCOOPhCClCClhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7PhCOOPhCFCFPhPhC.sub.3 H.sub.7 (n) n-C.sub.4 P H.sub.9PhCOOPhCFCFPhhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7PhCOOPhCClCClPhPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9PhCOOPhCClCClPhPhC.sub.4 H.sub.9 (n) n-C.sub.3 P H.sub.7PhCOOPhCFCFhOCOPhC.sub.3 H.sub.7 (n) n-C.sub.4 P H.sub.9PhCOOPhCFCFhOCOPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7PhCOOPhCCl CClPhOCOPhC.sub.3 H.sub.7 (n) n-C.sub.4 C H.sub.9PhCOOPhClCClPhOCOPhC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyCOOPhCFFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCOOPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyCOOPhCClCClPh.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCOOPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyCOOPhCFCFPhyC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCOOPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyCOOPhCClCClPhyC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCOOPhCClCClPhCyC.sub.4 H.sub.9 (n) n-C.sub.3 P H.sub.7CyCOOPhCFCFhOCOCyC.sub.3 H.sub.7 (n) n-C.sub.4 P H.sub.9CyCOOPhCFCFhOCOCyC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyCOOPhCClCClPhOCOCyC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCOOPhCClCClPhOCOCyC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyCHCHPhFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCHCHPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 P H.sub.7CyCHCHPhCClCClhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCHCHPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyCCPhCFCFPh.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCCPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyCCPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 C H.sub.9CyCCPhCClCClPh.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyCH.sub.2 OPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub. 4 H.sub.9CyCH.sub.2 OPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyCH.sub.2 OPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCH.sub.2 OPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyOCH.sub.2PhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyOCH.sub.2PhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyOCH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyOCH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyCHNPhFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCHNPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyCHNPhCClCClPh.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCHNPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 C H.sub.7CyNONPhCFCFPh.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyNO NPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyNONPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 P H.sub.9CyNONPhCClCClhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyNNPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyNNPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyNNPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 C H.sub.9CyNNPhCClCClPh.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyOPhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyOPhCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyOPhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyOPhCClCClPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyCH.sub.2PhCFCFPhC.sub.3 H.sub.7 (n) n-C.sub.4 P H.sub.9CyCH.sub.2hCFCFPhC.sub.4 H.sub.9 (n) n-C.sub.3 H.sub.7CyCH.sub.2PhCClCClPhC.sub.3 H.sub.7 (n) n-C.sub.4 H.sub.9CyCH.sub.2PhCClCClPhC.sub.4 H.sub.9 (n) ##STR46## ##STR47## ##STR48## ##STR49##

Air in a dried four-necked flask was replaced by nitrogen, and 220 ml of dry n-hexane, 44 ml of dry diethylether and 43.6 g (0.20 mol) of p-iodotoluene were introduced, and 111 g (0.26 mol) of a hexane solution of n-butyl lithium was gradually added thereto while cooling to -20.degree. C. and stirring, to obtain a p-methylphenyl lithium solution.

The solution thus obtained was cooled to -80.degree. C., and then the system was vacuumed, and tetrafluoroethylene gas was introduced by means of a gas buret in an amount corresponding to 0.30 mol. Then, the interior of the system was returned to atmospheric pressure with nitrogen gas, and stirring was continued at -80.degree. C. for one hour. Then, the reaction mixture was returned to room temperature, and nitrogen gas was introduced to purge unreacted tetrafluoroethylene gas.

The interior of the system was again cooled to -80.degree. C. Then, in the same manner as in the case of p-methylphenyl lithium, a p-trifluoromethylphenyl lithium solution prepared from 45.0 g (0.20 mol) of p-bromobenzotrifluoride and 94 g (0.22 mol) of a hexane solution of n-butyl lithium, was gradually dropwise added. After completion of the dropwise addition, stirring was continued for one hour at a temperature of -80.degree. C. Then, the reaction mixture was returned to room temperature and poured into ice water and neutralized with dilute hydrochloric acid. Then, the organic layer was separated.

The aqueous phase was extracted with ethyl ether, and then the ether layer was combined to the above organic layer. The combined organic layer was washed with water and then dried over anhydrous magnesium sulfate. The solvent was distilled off, and then toluene was added to the residue, and the mixture was purified by silica gel column chromatography, and after distilling the solvent off, the product was recrystallized from n-hexane, to obtain 7.55 g of the following desired compound. m.p.: 136.5.degree. C. ##STR50##

The IR spectrum (KBr tablet) of this compound is shown in FIG. 14.

In the same manner as in Examples 1-4, the following compounds can be prepared. C.sub.2 H.sub.5PhCFCFPhCF.sub.3 Trans-4-ethyl-4'-trifluoromethyl-.alpha.,.alpha .'-difluorostilbene ##STR51## n-C.sub.3 H.sub.7PhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9PhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11PhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13PhCFCFPhCF.sub.3 n-C.sub.7 H.sub.15PhCFCFPhCF.sub.3 n-C.sub.8 H.sub.17PhCFCFPhCF.sub.3 n-C.sub.9 H.sub.19PhCFCFPhCF.sub.3 n-C.sub.10 H.sub.21PhCFCFPhCF.sub.3 CH.sub.3 OPhCFCFPhCF.sub.3 C.sub.2 H.sub.5 OPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 OPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11 OPhCFCFPhCF.sub.3 n-C.sub.6 H.sub. 13 OPhCFCFPhCF.sub.3 n-C.sub.7 H.sub.15 OPhCFCFPhCF.sub.3 n-C.sub.8 H.sub.17 OPhCFCFPhCF.sub.3 n-C.sub.9 H.sub.19 OPhCFCFPhCF.sub.3 n-C.sub.10 H.sub.21 OPhCFCFPhCF.sub.3 CH.sub.3 OCH.sub.2PhCFCFPhCF.sub.3 C.sub.2 H.sub.5 OCH.sub.2PhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2PhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2PhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13 P OCH.sub.2hCFCFPhCF.sub.3 n-C.sub.7 H.sub.15 OCH.sub.2PhCFCFPhCF.sub.3 n-C.sub.8 H.sub.17 OCH.sub.2PhCFCFPhCF.sub.3 CH.sub.3PhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 P H.sub.7PhCFCFhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11PhCFCFPh CH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.7 H.sub.15PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.8 H.sub.17PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.9 C H.sub.19PhFCFPhCH.sub.2 CF.sub.3 n-C.sub.10 H.sub.21PhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OPhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 OPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 C OPhCFCFPhH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.7 H.sub.15 OPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.8 H.sub.17 OPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.9 H.sub.19 OPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.10 H.sub.21 OPhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OCH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.7 H.sub.15 OCH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.8 H.sub.17 OCH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3PhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.6 C H.sub.13PhFCFPhCF.sub.2 CF.sub.3 n-C.sub.7 H.sub.15PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.8 H.sub.17PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.9 H.sub.19 PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.10 H.sub.21PhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3 OPhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 C OPhCFCFPhF.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.7 H.sub.15 OPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.8 H.sub.17 OPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.8 H.sub.17 OPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.9 H.sub.19 OPhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OCH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.7 H.sub.15 OCH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.8 H.sub.17 OCH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3CyPhCFCFPhCF.sub.3 Trans-4-(4-methyl-trans-cyclohexyl)-4'-trifluoromethyl-.alpha.,.alpha.'- difluorostilbene ##STR52## C.sub.2 H.sub.5CyPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7CyPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9CyPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11CyPhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13CyPhCFCFPhCF.sub.3 n-C.sub.7 H.sub.15CyPhCFCFPhCF.sub.3 CH.sub.3 OCyPhCFCFPhCF.sub. 3 C.sub.2 H.sub.5 OCyPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OCyPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 OCyPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11 OCyPhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13 OCyPhCFCFPhCF.sub.3 CH.sub.3 OCH.sub.2CyPhCFCFPhCF.sub.3 C.sub.2 H.sub.5 OCH.sub.2CyPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2CyPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 C OCH.sub.2yPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2CyPhCFCFPhCF.sub.3 CH.sub.3CyPhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5CyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7CyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9CyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11CyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13CyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.7 H.sub.15CyPhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OCyPhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OCyPhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCyPhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2CyPhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 C OCH.sub.2CyPhCFCFPhH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2CyPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 P OCH.sub.2CyPhCFCFhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 P OCH.sub.2CyPhCFCFhCH.sub.2 CF.sub.3 CH.sub.3CyPhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5CyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7CyPhCFCFPhCF.sub. 2 CF.sub.3 n-C.sub.4 H.sub.9CyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11CyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.6 C H.sub.13yPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.7 H.sub.15CyPhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3 OCyPhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OCyPhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2CyPhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCH.sub.2CyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2CyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2CyPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCH.sub. C 2CyPhCFFPhCF.sub.2 CF.sub.3 CH.sub.3PhPhCFCFPhCF.sub.3 Trans-4-(4-methylphenyl)-4'-trifluoromethyl-.alpha.,.alpha.'-difluorosti lbene ##STR53## C.sub.2 H.sub.5PhPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7PhPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9PhPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11PhPhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13PhPhCFCFPhCF.sub.3 n-C.sub.7 H.sub.15PhPhCFCFPhCF.sub.3 CH.sub.3 OPhPhCFCFPhCF.sub.3 C.sub.2 H.sub.5 OPhPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OPhPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 OPhPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11 OPhPhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13 OPhPhCFCFPhCF.sub.3 CH.sub.3 OCH.sub.2PhPhCFCFPhCF.sub.3 C.sub.2 H.sub.5 OCH.sub.2PhPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 P OCH.sub.2hPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2PhPhCFCFPhCF.sub.3 CH.sub.3PhPhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5PhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7PhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9PhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11PhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13PhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.7 H.sub.15PhPhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OPhPhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 OPhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 P OhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OPhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OPhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OPhPhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2PhPhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 C OCH.sub.2PhPhCFCFPhH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhPhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 P OCH.sub.2PhPhCFCFhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 P OCH.sub.2PhPhCFCFhCH.sub.2 CF.sub.3 CH.sub.3PhPhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5PhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7PhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9PhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11PhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.6 P H.sub.13hPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.7 H.sub.15PhPhCF CFPhCF.sub.2 CF.sub.3 CH.sub.3 OPhPhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OPhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OPhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OPhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OPhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OPhPhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2PhPhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCH.sub.2PhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2PhPhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2PhPhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3PhCFCFPhPhCF.sub.3 C.sub.2 H.sub.5PhCFCFPhPhCF.sub.3 n-C.sub.3 H.sub.7PhCFCFPhPhCF.sub.3 n-C.sub.4 H.sub.9PhCFCFPh PhCF.sub.3 n-C.sub.5 H.sub.11PhCFCFPhPhCF.sub.3 n-C.sub.6 H.sub.13PhCFCFPhPhCF.sub.3 n-C.sub.7 H.sub.15PhCFCFPhPhCF.sub.3 CH.sub.3 OPhCFCFPhPhCF.sub.3 C.sub.2 H.sub.5 OPhCFCFPhPhCF.sub.3 n-C.sub.3 H.sub.7 OPhCFCFPhPhCF.sub.3 n-C.sub.4 H.sub.9 OPhCFCFPhPhCF.sub.3 n-C.sub.5 H.sub.11 OPhCFCFPhPhCF.sub.3 n-C.sub.6 H.sub.13 OPhCFCFPhPhCF.sub.3 CH.sub.3 OCH.sub.2PhCFCFPhPhCF.sub.3 C.sub.2 H.sub.5 OCH.sub.2PhCFCFPhPhCF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhCFCFPhPhCF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2PhCFCFPhPhCF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2PhCFCFPhPhCF.sub.3 CH.sub.3PhCFCFPhPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5PhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7PhCFCF PhPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9PhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11PhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13PhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.7 H.sub.15PhCFCFPhPhCH.sub.2 CF.sub.3 CH.sub.3 OPhCFCFPhPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 OPhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 P OhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OPhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OPhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OPhCFCFPhPhCH.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2PhCFCFPhPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 C OCH.sub.2PhCFCFPhPhH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhCFCFPhPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 P OCH.sub.2PhCFCFPhhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 P OCH.sub.2PhCFCFPhhCH.sub.2 CF.sub.3 CH.sub.3PhCFCFPhPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5PhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 PhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9PhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11PhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.6 P H.sub.13hCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.7 H.sub.15PhCFCFPhPhCF.sub.2 CF.sub.3 CH.sub.3 OPhCFCFPhPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OPhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OPhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OPhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OPhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OPhCFCFPhPhCF.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2PhCFCFPhPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCH.sub.2PhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2PhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2PhCFCFPhPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2PhCFCFPhPhCF.sub.2 CF.sub.3 CH.sub.3CyCH.sub.2 C CH.sub.2PhCFCFPhF.sub.3 Trans-4-[2-(4-methyl-trans-cyclohexyl)ethyl]-4'-trifluoromethyl-.alpha., .alpha.'-difluorostilbene ##STR54## C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.6 H.sub. 13CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 CH.sub.3 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 C.sub.2 H.sub.5 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13 OCyCH.sub.2 C CH.sub.2PhCFCFPhF.sub.3 CH.sub.3 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 C.sub.2 H.sub.5 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2CyCH.sub.2 P CH.sub.2hCF CFPhCF.sub.3 CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OCyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCyCH.sub.2 CH.sub. 2PhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCH.sub.2 CF.sub.3 CH.sub.3CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7CyCH.sub.2 C CH.sub.2PhFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.6 H.sub.13CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.7 H.sub.15CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCyCH.sub.2 C CH.sub.2PhFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCyCH.sub.2 P CH.sub.2hCFCFPhCF.sub.2 CF.sub.3 n-C.sub.5 H.sub.11 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.6 H.sub.13 OCyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3 OCH.sub.2CyCH.sub.2 C CH.sub.2PhFCFPhCF.sub.2 CF.sub.3 C.sub.2 H.sub.5 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.3 H.sub.7 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub.4 H.sub.9 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 n-C.sub. 5 H.sub.11 OCH.sub.2CyCH.sub.2 CH.sub.2PhCFCFPhCF.sub.2 CF.sub.3 CH.sub.3CyCH.sub.2 OPhCFCFPhCF.sub.3 Trans-4-(4-methyl-trans-cyclohexyl)methoxy-4'-trifluoromethyl-.alpha.,.a lpha.'-difluorostilbene ##STR55## C.sub.2 H.sub.5CyCH.sub.2 OPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7CyCH.sub.2 OPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9CyCH.sub.2 OPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11CyCH.sub.2 OPhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13CyCH.sub.2 OPhCFCFPhCF.sub.3 CH.sub.3 OCyCH.sub.2 C OPhCFFPhCF.sub.3 C.sub.2 H.sub.5 OCyCH.sub.2 OPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OCyCH.sub.2 OPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 OCyCH.sub.2 C OPhCFFPhCF.sub.3 n-C.sub.5 H.sub.11 OCyCH.sub.2 OPhCFCFPhCF.sub.3 CH.sub.3CyOCH.sub.2PhCFCFPhCF.sub.3 C.sub.2 H.sub.5CyOCH.sub.2PhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7CyOCH.sub.2PhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9CyOCH.sub.2PhCFCFPhCF.sub.3 n-C.sub.5 C H.sub.11CyOCH.sub.2PhCFCFPhF.sub.3 n-C.sub.6 C H.sub.13CyOCH.sub.2PhCFCFPhF.sub.3 CH.sub.3CyCOOPhCFCFPhCF.sub.3 C.sub.2 H.sub.5CyCOOPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7CyCOOPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9CyCOOPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11CyCOOPhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13CyCOOPhCFCFPhCF.sub.3 CH.sub.3CyCCPhCFCF PhCF.sub.3 C.sub.2 H.sub.5CyCCPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7CyCCPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9CyCCPhCFCFPhCF.sub.3 n-C.sub.5 H.sub.11CyCCPhCFCFPhCF.sub.3 n-C.sub.6 H.sub.13CyCCPhCFCFPhCF.sub.3 CH.sub.3 OCyCCPhCFCFPhCF.sub.3 C.sub.2 H.sub.5 OCyCCPhCFCFPhCF.sub.3 n-C.sub.3 H.sub.7 OCyCCPhCFCFPhCF.sub.3 n-C.sub.4 H.sub.9 OCyCCPhCFCF PhCF.sub.3 n-C.sub.5 H.sub.11 OCyCCPhCFCFPhCF.sub.3

Further, the following compounds can be prepared by changing tetrafluoroethylene to chlorotrifluoroethylene, perfuluoro-2-butene or perfluoropropene. ##STR56##

In the same manner, the following compounds can be prepared. ##STR57##

The anisotropy of refractive index (.DELTA.n) of a liquid crystal composition of Merck Co. "ZLI-1565" was 0.1245. When 5 wt % of the compound of Example 1 was added to 95 wt % of this liquid crystal composition, the anisotropy of refractive index (.DELTA.n) of the liquid crystal composition became 0.1371.

Each of such liquid crystal compositions was injected into a cell prepared by combining ITO transparent electrodes coated with polyimide and subjected to rubbing treatment and having a space of 8 .mu.m between the substrates, and the cell was operated by multiplex drive at 25.degree. C. to measure the response speed. The liquid crystal device using the liquid crystal composition of the present invention showed a response speed quicker by about 20% than the liquid crystal device using the conventional composition.

The anisotropy of refractive index (.DELTA.n) of a liquid crystal composition prepared by adding 2.5 wt % of the compound of Example 4 to 97.5 wt % of the liquid crystal composition of Merck Co. "ZLI-1565" was 0.1279. Each of the liquid crystal compositions was injected into a cell prepared by combining ITO transparent electrodes coated with polyimide and subjected to rubbing treatment and having a space of 8 .mu.m between the substrates, and the cell was operated by multiplex drive at 25.degree. C. to measure the response speed. The liquid crystal device using the liquid crystal composition of the present invention showed a response speed quicker by about 10% than the liquid crystal device using the conventional composition.

As described in the foregoing, the present invention provides trans-dihalogenostilbene compounds of the formula: ##STR58## particularly trans-dihalogenostilbene compounds of the formula: ##STR59## as novel compounds, and a liquid crystal composition containing at least one of such compounds and a liquid crystal electro-optical display device having such a liquid crystal composition interposed between a pair of substrates provided with electrodes, whereby it is possible to increase the anisotropy of refractive index (.DELTA.n) and to obtain a liquid crystal device having a high response speed.