US 4,381,243 AGrant

Aliphatic Branched Olefin Dioxolanes, Dithiolanes, and Oxathiolanes and Uses Thereof in Augmenting or Enhancing the Aroma and/or Taste of Consumable Materials

Issue Date:1983-04-26

•5 Claims

•19 Drawing Sheets

Abstract

Described is the genus of compound having the structure: ##STR1## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represent carbon-carbon single bonds as well as methods for augmenting or enhancing the aroma and/or taste of consumable materials including foodstuffs, chewing gums, medicinal products, toothpastes, chewing tobaccos, perfume compositions, perfumed articles, smoking tobaccos and smoking tobacco articles using such dioxolanes, oxathiolanes and dithiolanes. The perfumed articles include solid or liquid anionic, cationic, nonionic or zwitterionic detergents, fabric softener compositions, dryer-added fabric softener articles, hair preparations, deodorant compositions, as well as bleaching compositions containing the same.

Metadata

Assignee

International Flavors & Fragrances Inc.

Inventor

Richard M. Boden

Application Information

Application Number:US 3228711

Filing Date:1981-11-19

Priority Date:1980-12-04

Art Unit:144

Classifications

IPC:

D06M 1318

Field of Search:

2528.9

Patent Drawings (19 sheets)

Description

BACKGROUND OF THE INVENTION

The instant invention provides branched chain olefin dioxolanes, dithiolanes and oxathiolanes which are used to augment or enhance the aroma and/or taste of consumable materials including foodstuffs, chewing gums, medicinal products, toothpastes, chewing tobaccos, perfume compositions, colognes, perfumed articles, smoking tobaccos and smoking tobacco articles.

Materials which can provide pleasant cedar, amber, woody, sweet, patchouli-like fragrance notes are known in the art of perfumery. Many of the natural materials which provide such fragrances and contribute desired nuances to perfumery compositions are high in cost, vary in quality from one batch to another and/or are generally subject to the usual variations of natural products.

There is, accordingly, a continuing effort to find synthetic materials which will replace the essential fragrance notes provided by natural essential oils or compositions thereof. Unfortunately, many of the synthetic materials either have the desired nuances only to a relatively small degree or else contribute undesirable or unwanted odor to the composition. The search for materials which can provide a more refined patchouli-like fragrance has been difficult and relatively costly in the areas of both natural products and synthetic products.

In addition, artificial flavoring agents for foodstuffs have received increasing attention in recent years. In many places such food flavoring agents have been preferred over natural flavoring agents at least in part due to their diminished cost and their reproducible flavor qualities. For example, natural food flavoring agents such as extracts, concentrates and the like are often subject to wide variations due to changes in the quality, type and treatment of the raw materials.

Such variations can be reflected in the end product and result in unfavorable flavor characteristics in said end product. Additionally, the presence of the natural product in the ultimate food may be undesirable because of increased tendency to spoil. This is particularly troublesome in food and food uses where such products as dips, soups, chips sausages, gravies and the like are apt to be stored prior to use.

The fundamental problem in creating artificial flavoring agents is that the artificial flavor to be achieved be as natural as possible. This generally proves to be a difficult task since the mechanism for flavor development in many foods is not completely known. This is particularly noticable in products having nutty, earthy, woody-balsamic, fresh walnut kernel and walnut skin flavor characteristics.

Reproduction of nutty, earthy, woody-balsamic, fresh walnut kernel and walnut skin flavor and aroma has been the subject of long and continuing searches by those engaged in the production of foodstuffs and beverages. The severe shortages of food in many parts of the world has given rise to the development of previously unused sources of protein which are unpalatable. Accordingly, the need has arisen for the use of flavoring materials which will make such sources of protein palatable to human sensory organs.

Furthermore, chemical compounds which can provide sweet, woody, vetiver and cedar-like aroma and taste nuances to smoking tobacco both prior to and on smoking in both the main stream and the side stream particularly where black tobacco aroma and taste nuances are desired and natural cigar-like taste nuances are desirable in the art of smoking tobacco aromatization. Many of the natural materials which provide such aroma and taste nuances are high in cost, unobtainable at times, vary in quality from one batch to another and/or are generally subject to the usual variations of natural products.

U.S. Pat. No. 3,760,303 (1971) discloses the cyclic acetal of 2,4-hexadienal with ethylene glycol and discloses its use in the bouquet of citrus-type odorant formulations. This compound has the structure: ##STR2##

Netherlands published application No. 6,406,295 (1965) discloses gamma, delta-unsaturated aldehyde derivatives for use as perfumes, for example in soaps. These derivatives are cyclic acetals and have the structures: ##STR3## wherein R is hydrogen or methyl.

German Offenlegungschrift No. 2,103,567 (1971) discloses the use as perfumes of 2-(1-alkyl-2-alkenyl)-1,3-dioxolanes having the structure: ##STR4##

In the Federal Register 31,7563 (May 26, 1966) and in Chem. Abstracts 62, 11055e the compound having the structure: ##STR5## is disclosed to be useful as a synthetic food flavoring substance.

Beilstein, Vol. E II19 at page 16:5(2) discloses 2-(1-methyl-1-butenyl)1,3-dioxolane having the structure: ##STR6## The Beilstein Abstract summarizes the article by Hibert et al. J. Am. Chem. Soc. 51 (1929) page 611 (Title: "Studies on Reactions Relating to Carbohydrates and Polysaccharides. XX. Comparison of Tendencies of Saturated and Unsaturated Aldehydes Toward Cyclic Acetal Formation"). This compound is shown to be prepared by reacting alpha methyl beta ethyl acrolein with ethylene glycol using a 40% sulfuric acid catalyst. The compound is indicated to have a boiling point of 170.degree.-174.degree. C. at 12 mm Hg pressure.

2-(1-ethyl-1-pentenal)-1,3-dioxolane and 2-(1-propenyl)-4-methyl-1,3-dioxolane are shown to be prepared by Heywood and Phillips, J. Org. Chem. 25 (1960) page 1699 entitled: "The Oxidation of Unsaturated Acetals and Acylals With Peracetic Acid".

None of the foregoing references discloses or implies the subject matter of the instant invention.

Furthermore, various heterocyclic compounds containing three, four or five sulfur atoms in the ring have been said to be flavorful or aroma-imparting. Thus, Chang et al in Chemistry and Industry for Nov. 23, 1968, pages 1639-1641, identified, 3,5-dimethyl-1,2,4-trithiolane in the volatile flavor compounds of boiled beef; and Wada et al in U.S. Pat. No. 3,503,758 issued on Mar. 31, 1970, describes pentathiepane and various tetrathiepanes as having a good aroma and, therefore, useful as flavor enhancers. The tetra- and pentathiepanes possess a sweet, meaty flavor. Polyalkyl symmetrical trithianes have been disclosed in copending U.S. application Ser. No. 166,683 filed July 28, 1971, as having a sweet, nutty aroma and taste and suitable for fruit, net and meat flavors.

Five or six membered heterocyclic compounds having two sulfur atoms in the ring are disclosed to be useful in altering the flavor or aroma of foodstuffs in U.S. application Ser. No. 272,396 filed on July 17, 1972. Such dithio heterocyclic compounds in that case include dithiolanes and dithianes, which may be alkyl substituted or non-alkyl substituted. According to U.S. application Ser. No. 272,396, dithio heterocyclic compounds found suitable are represented by one of the following formulae: ##STR7## and each of R.sub.1 to R.sub.4 is hydrogen or a lower alkyl radical of 1 to 3 carbon atoms.

Although a number of meta-dioxanes and meta-dioxolanes are indicated in the prior art to have specific organoleptic properties, such properties of the meta-dioxanes and meta-dioxolanes are different in kind from the aromas and tastes of the heterocyclic oxathio compounds of our invention. Thus, German Offenlegungschrift 2,233,245 discloses 1,3 dioxolanes of the formula: ##STR8## wherein R.sub.1 or R.sub.2 can be, interalia, ethyl or propyl as baked goods aromas.

Beilstein discloses the following:

Furthermore, in accordance with the disclosure of U.S. Pat. No. 4,031,257, it was found that certain 5 or 6 membered heterocyclic compounds having one sulfur atom and one oxygen atom in the ring (hereinafter called "oxathio heterocyclic compounds"), a number of which are novel compounds, are useful in altering, modifying or enhancing the flavor or aroma of a foodstuff, chewing gum or medicinal product. Such oxathio heterocyclic compounds include oxathiolanes and oxathianes, which may be alkyl substituted, carboxyalkyl substituted and/or acyl substituted. The oxygen atom and the sulfur atom in the ring are separated by one carbon atom. Thus, the oxathio heterocyclic compounds found suitable according to this invention may be represented by the following formula: ##STR35## wherein n is 0 or 1; R.sub.1 is hydrogen or C.sub.1 -C.sub.9 alkyl; R.sub.2 is hydrogen, lower alkyl, aryl, carboalkoxy or alkanoyl; or R.sub.1 and R.sub.2 taken together complete a carbocyclic ring having from five up to nine carbon atoms; R.sub.3 and R.sub.4 are the same or different and are each hydrogen or lower alkyl; with the sum of the carbon atoms in R.sub.1, R.sub.2, R.sub.3 and R.sub.4 being greater than or equal to 1; and the sum of the carbon atoms in R.sub.1 and R.sub.2 being less than or equal to nine.

Furthermore, it is disclosed in U.S. Pat. No. 4,159,347 that solid and liquid foodstuff, chewing gum, medicinal product and toothpaste compositions and flavoring compositions therefor having sweet, fruity, gooseberry, green, aniseed, licorice, floral and herbal aroma characteristics and sweet, fruity, gooseberry, green, spearmint, aniseed, licorice, floral and herbal flavor characteristics with albedo-like nuances may be provided by the utilization of cyclic acetals of 2-methyl-2-pentenal having the generic structure: ##STR36## wherein R is selected from the group consisting of hydrogen and methyl and the wavy lines represent covalent bonds, and signify a "cis" or "trans" configuration of the dioxolane moiety with respect to the ethyl moiety; each moiety being bonded to the ethenyl group of the molecule.

Oxathiolanes, dioxolanes and dithiolanes are described in the following publication:

U.S. Pat. No. 4,042,601

U.S. Pat. No. 3,863,013

However, nothing existing in the prior art discloses the compounds described by the generic structure: ##STR37## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represent carbon-carbon single bonds.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. AA represents the GLC profile for the reaction product of Example A using a 70% sulfuric acid catalyst at 35.degree. C.

FIG. AB represents the GLC profile for the reaction product of Example A using the Amberlyst.RTM. 15 acidic ion exchange resin catalyst at a temperature of 150.degree. C.

FIG. AC represents the GLC profile for the reaction product of Example A, using an Amberlyst.RTM. 15 catalyst at 100.degree. C.

FIG. AD represents the GLC profile for the reaction product of Example A, using a sulfuric acid catalyst and an alpha-methylstyrene diluent at 35.degree. C. according to the conditions of United Kingdom Patent Specification 796,130 (crude reaction product).

FIG. AE represents the GLC profile for the reaction product of Example A, using a sulfuric acid catalyst, at 35.degree. C. and an alpha-methyl styrene diluent according to the conditions of United Kingdom Patent Specification 796,130 (distilled reaction product). Distillation range: vapor temperature, 36.degree.-40.degree. C.; liquid temperature, 74.degree.-94.degree. C.; pressure, 4-5 mm/Hg.

FIG. BA represents the NMR spectrum for Peak 1 of the GLC profile of FIG. AE.

FIG. BB represents the infra-red spectrum for Peak 1 of the-GLC profile of FIG. AE.

FIG. CA represents the NMR spectrum for Peak 2 of the GLC profile of FIG. AE.

FIG. CB represents the infra-red spectrum for Peak 2 of the GLC profile of FIG. AE.

FIG. D represents the NMR spectrum for Peak 2 of the GLC profile of FIG. AB.

FIG. 1 sets forth the GLC profile for the reaction product of Example I, containing compounds defined according to the structure: ##STR38## wherein in each molecule of the mixture, one of the dashed lines is a carbon-carbon double bond and the other of the dashed lines are carbon-carbon single bonds.

FIG. 2A represents the infra-red spectrum of Peak 3 of the GLC profile of FIG. 1.

FIG. 2B represents the infra-red spectrum of Peak 4 of the GLC profile of FIG. 1.

FIG. 2C represents the infra-red spectrum for Peak 5 of the GLC profile of FIG. 1.

FIG. 2D represents the infra-red spectrum for Peak 6 of the GLC profile of FIG. 1.

FIG. 2E represents the infra-red spectrum for Peak 7 of the GLC profile of FIG. 1.

FIG. 2F represents the infra-red spectrum for Peak 8 of the GLC profile of FIG. 1.

FIG. 2G represents the infra-red spectrum for Peak 9 of the GLC profile of FIG. 1.

FIG. 2H represents the infra-red spectrum for Peak 10 of the GLC profile of FIG. 1.

FIG. 2J represents the NMR spectrum for a mixture of compounds having the structures: ##STR39## produced according to Example I.

FIG. 2K represents the NMR spectrum for the compound having the structure: ##STR40## produced according to Example I.

FIG. 2L represents the NMR spectrum for the compound containing the structure: ##STR41## produced according to Example I.

FIG. 3 represents the GLC profile for the reaction product of Example II containing a mixture of compounds, each of which is defined according to the generic structure: ##STR42## wherein in each molecule one of the dashed lines is a carbon-carbon double bond and each of the other of the dashed lines are carbon-carbon single bonds.

FIG. 4 represents the infra-red spectrum for the product produced according to Example II containing the compounds having the structures: ##STR43##

FIG. 5 represents the mass spectrum for the reaction product of Example II, containing the compounds having the structures: ##STR44##

FIG. 6 represents the GLC profile for the reaction product of Example III containing compounds defined according to the generic structure: ##STR45## wherein in each of the molecules of the mixture, one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represents carbon-carbon single bonds.

FIG. 7 represents the infra-red spectrum for the reaction product of Example III containing the compounds having the structures: ##STR46##

FIG. 8 represents the mass spectrum for the reaction product of Example III containing the compounds having the structures: ##STR47##

FIG. 9 represents the GLC profile for the reaction product of Example IV, containing a mixture of compounds, each of which is defined according to the generic structure: ##STR48## wherein in each of the molecules, one of the dashed lines represents a carbon-carbon double bond and each of the other of the dashed lines represents carbon-carbon single bonds.

FIG. 10 represents the infra-red spectrum for the reaction product of Example IV containing the compounds having the structures: ##STR49##

FIG. 11 represents the mass spectrum for the reaction product of Example IV containing the compounds having the structures: ##STR50##

FIG. 12 represents the GLC profile for the reaction product of Example VA containing the structures defined according to the genus having the structure: ##STR51## wherein in each of the molecules of the mixture, one of the dashed lines represents a carbon-carbon double bond and each of the other of the dashed lines represents carbon-carbon single bonds.

FIG. 13 represents the GLC profile for the reaction product of Example VB containing a mixture of compounds defined according to the structure: ##STR52## wherein in each of the molecules of the mixture, one of the dashed lines represents a carbon-carbon double bond and each of the other of the dashed lines represents carbon-carbon single bonds.

FIG. 14 represents the GLC profile for the reaction product of Example VIIA containing a mixture of compounds defined according to the genus having the structure: ##STR53## wherein in each of the molecules of the mixture, one of the dashed lines represents a carbon-carbon double bond and each of the other of the dashed lines represents carbon-carbon single bonds.

FIG. 15 sets forth the GLC profile for the reaction product produced according to Example IX(A) containing the compounds defined according to the generic structure: ##STR54## wherein one of the dashed lines in each of the molecules represents a carbon-carbon double bond and the other of the dashed lines in each of the molecules represents a carbon-carbon single bond.

FIG. 16 is the NMR spectrum for the mixture of compounds produced according to Example IX(A) containing the compounds defined according to the generic structure: ##STR55##

FIG. 17 is the infra-red spectrum for the product produced according to Example IX(A) containing the compounds defined according to the generic structure: ##STR56##

FIG. 17(A) is the GLC profile for the reaction product produced according to Example IX(B) containing the compounds defined according to the generic structure: ##STR57##

FIG. 17(B) is the GLC profile for the distillation product (Fraction 9) of the reaction product of Example IX(B) containing the compounds defined according to the generic structure: ##STR58##

FIG. 18 is the GLC profile for the reaction product of Example X.

THE INVENTION

The instant invention provides compounds having the generic structure: ##STR59## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or surfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represents carbon-carbon single bonds. These compounds are useful in augmenting or enhancing the aroma and/or taste of consumable materials including perfume compositions, colognes, perfumed articles, foodstuffs, chewing gum, toothpastes, medicinal products, chewing tobaccos, smoking tobacco articles and smoking tobacco compositions.

The class of compounds having the generic structure: ##STR60## is defined in the group called "dioxolanes"; "dithiolanes" and "oxathiolanes". Thus, dithiolanes are compounds wherein both X and Y are sulfur. Dioxolanes are compounds wherein X and Y are both oxygen. Oxathiolanes are compounds wherein one of X or Y is sulfur and the other of X or Y is oxygen. Each of the compounds defined according to the generic structure: ##STR61## is derived using "diisoamylene" as a starting material.

Diisoamylene is indicated to be synthesized in the following references:

i-Murphy & Lane, Ind. Eng. Chem., Prod. Res. Dev., Vol. 14, No. 3, 1975 p. 167 (Title: Oligomerization of 2-Methyl-2-Butene in Sulfuric Acid and Sulfuric-Phosphoric Acid Mixtures).

ii-Whitmore & Mosher, Vol. 68, J. Am. Chem. Soc., February, 1946, p. 281 (Title: The Depolymerization of 3,4,5,5-Tetramethyl-2-hexene and 3,5,5-Trimethyl-2-heptene in Relation to the Dimerization of Isoamylenes).

iii-Whitmore & Stahly, Vol. 67, J. Am. Chem. Soc., December, 1945, p. 2158 (Title: The Polymerization of Olefins. VIII The Depolymerization of Olefins in Relation to Intramolecular Rearrangements. II).

iv-U.S. Pat. No. 3,627,700, issued on Dec. 14, 1971, (Zuech).

v-U.S. Pat. No. 3,538,181, issued on Nov. 3, 1970, (Banks).

vi-U.S. Pat. No. 3,461,184, issued on Aug. 12, 1969 (Hay, et al).

vii-Gurwitsch, Chemische Berichte, 1912, Vol. 2, p. 796 (Production of Di-isoamylene From Isoamylene Using Mercury Acetate Catalyst).

United Kingdom Pat. No. 796,130 published on June 4, 1958 discloses the synthesis of polyalkylindanes by means of, interalia, reacting alpha-methylstyrene with trimethylethene (2-methyl-butene-2) in the presence of an acid catalyst such as, sulfuric acid or boron trifluoride methyletherate. It is further indicated that such compounds are useful intermediates in the production of perfumery compounds. Apparently, however, the more volatile di-isoamylenes produced as side-products in the reaction of 2-methyl-butene-2 with alpha-methylstyrene are discarded.

Briefly, our invention contemplates augmenting or enhancing fragrances of such consumable materials as perfumes, perfumed articles (e.g. solid or liquid anionic, cationic, nonionic or zwitterionic detergents, cosmetic poweders, fabric softener compositions, dryer-added fabric softener articles, hair conditioners, and bleaching compositions including hypochlorite bleaches) and colognes by adding thereto a small, but effective, amount of at least one of the compounds defined according to the generic structure: ##STR62## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represent carbon-carbon single bonds.

Furthermore, our invention also contemplates augmenting or enhancing the aroma or taste of such consumable materials as foodstuffs, chewing gums, medicinal products, toothpastes and chewing tobaccos by adding thereto a small, but effective, amount of at least one of the compounds defined according to the generic structure: ##STR63## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represent carbon-carbon single bonds.

Furthermore, our invention contemplates augmenting or enhancing the aroma or taste of smoking tobacco or smoking tobacco articles in both the main stream and the side stream both prior to and on smoking by adding to smoking tobacco or part of a smoking tobacco article such as a wrapper or filter a small, but effective, amount of at least one of the compounds defined according to the generic structure: ##STR64## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represent carbon-carbon single bonds.

The dioxolane, dithiolane and oxathiolane compounds of our invention augment or enhance pleasant cedar, amber-like, woody, sweet and patchouli-like aroma characteristics of perfumes, perfumed articles and colognes thereby causing one or more of said dioxolane, dithiolane or oxathiolane compounds to be useful particularly in patchouli-like fragrances. The great stability of such compounds particularly the dioxolanetype compounds causes them to be useful particularly in patchouli-fragranced hypochlorite type bleach compositions such as, for example, CLOROX.RTM..

The dithiolane, dioxolane and oxathiolane compounds of our invention also augment or enhance the sweet, woody, vetiver-like, and cedar-like aroma and taste nuances of black tobacco and cigar tobacco both prior to and on smoking in both the main stream and the side stream.

The dioxolane, dithiolane and oxathiolane compounds of our invention also augment or enhance the aroma or taste of foodstuffs, chewing gums, medicinal products, toothpastes and chewing tobaccos by imparting or enhancing the nutty, earthy, woody-balsamic, walnut kernel-like and walnut skin flavor and aroma nuances thereof.

The dithiolanes, dioxolanes and oxathiolane compounds of our invention defined according to the generic structure: ##STR65## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represents carbon-carbon single bonds, may be prepared by first preparing diisoamylene by means of dimerization of isoamylene having the structure: ##STR66## whereby the compounds having the structures: ##STR67## are formed. These compounds can also be defined according to the structure: ##STR68## wherein R'.sub.1, R'.sub.2, R'.sub.3, R'.sub.4 and R'.sub.5 represent hydrogen or methyl with the provisos that (i) at least one of R'.sub.1 and R'.sub.2 represents methyl, (ii) at least one of R'.sub.3 and R'.sub.4 represents methyl; (iii) the sum of the carbon atoms in R'.sub.1, R'.sub.2, R'.sub.3, R'.sub.4 and R'.sub.5 is 3 and (iv) R'.sub.1 and R'.sub.2 represent hydrogen when R'.sub.5 is methyl. These diisoamylene compounds may be prepared according to the procedures of the following references:

i-Murphy & Lane, Ind. Eng. Chem., Prod. Res. Dev., Vol. 14, No. 3, 1975 p. 167 (Title: Oligomerization of 2-Methyl-2-Butene in Sulfuric and Sulfuric-Phosphoric Acid Mixtures).

iv-U.S. Pat. No. 3,627,700, issued on Dec. 14, 1971, (Zuech).

v-U.S. Pat. No. 3,538,181, issued on Nov. 3, 1970, (Banks).

vi-U.S. Pat. No. 3,461,184, issued on Aug. 12, 1969 (Hay et al).

vii-Gurwitsch, Chemische Berichte, 1912, Vol. 2, p. 796 (Production of Di-isoamylene From Isoamylene Using Mercury Acetate Catalyst).

The resulting compounds are then acylated or thioacylated with an acylating agent such as an acylhalide or an acylanhydride or a thioacylhalide or a thioacylanhydride having the generic structure: ##STR69## wherein Z represents oxygen or sulfur; wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl and wherein .theta. represents halogen which may be chloro or bromo, whereby a compound having the structure: ##STR70## is formed wherein Z is one of oxygen or sulfur and one of the dashed lines is a carbon-carbon double bond and the other of the dashed lines in each of the molecules formed is a carbon-carbon single bond. Such compounds can be further defined according to one of the structures: ##STR71## wherein R.sub.1 is C.sub.1 -C.sub.3 lower alkyl and one of the dashed lines in each of the molecules represents a carbon-carbon double bond and the other of the dashed lines in each of the molecules represents carbon-carbon single bonds.

These thiones or ketones, as the case may be, are then further reacted with either a thiirane, epoxide, glycol, dithiol or thiol-alcohol having one of the structures: ##STR72## thereby forming a compound having the generic structure: ##STR73## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represents carbon-carbon single bonds.

The foregoing sequence of reactions is illustrated as follows: ##STR74## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represents carbon-carbon single bonds and wherein Z represents one of X or Y and wherein R'.sub.1, R'.sub.2, R'.sub.3, R'.sub.4 and R'.sub.5 represent hydrogen or methyl with the provisos that (i) at least one or R'.sub.1 and R'.sub.2 represents methyl; (ii) at least one of R'.sub.3 and R'.sub.4 represents methyl; (iii) the sum of the carbon atoms in R'.sub.1, R'.sub.2, R'.sub.3, R'.sub.4 and R'.sub.5 is 3 and (iv) R'.sub.1 and R'.sub.2 represent hydrogen when R'.sub.5 is methyl.

The compounds produced according to our invention may be in the form of mixtures of isomers; that is, mixtures of "cis" and "trans" isomers as well as mixtures of "stereoisomers". Thus, the compound having the structure: ##STR75## for example, may have the methyl group on the dioxolane ring either in "cis" or "trans" configuration about the said dioxolane ring as follows: ##STR76## Furthermore, the double bond in the side chain of the dioxolane ring may be in either "cis" or "trans" configuration with respect to the methyl moieties bonded to the carbon atoms forming the carbon-carbon double bond as follows: ##STR77##

Furthermore, a "stereoisomer" of such a compound may be shown as follows: ##STR78## wherein the symbol:

" * "

represents the location of an asymetric carbon atom.

Furthermore, the foregoing reaction sequence may be more specifically illustrated by the following reaction wherein the thiirane or epoxide compound may be in either "cis" or "trans" configuration and wherein R.sub.4 and R.sub.5 represent hydrogen: ##STR79##

The reaction products of our invention which are oxathianes may also be prepared by first reacting the diisoamylene acylation derivatives with phosphorous pentasulfide to form a thioketone and then reacting the resulting thioketone with vicinal epoxides according to the reaction scheme: ##STR80## wherein R.sub.1 represents C.sub.1 -C.sub.3 lower alkyl; R.sub.2, R.sub.3, R.sub.4 and R.sub.5 represent the same or different hydrogen or C.sub.1 -C.sub.3 lower alkyl; X and Y represent the same or different oxygen or sulfur; and one of the dashed lines represents a carbon-carbon double bond and the other of the dashed lines represents carbon-carbon single bonds.

When carrying out the reaction scheme: ##STR81## the diisoamylene material which is first produced may either be separated into constitutent isomers or may be used "as is" in the subsequent acylation reaction or thioacylation reaction. Thus, for example, the subsequent acylation reaction may be carried out on the mixture of diisoamylene molecules according to the reaction: ##STR82## wherein the acylation is carried out using an organic acid anhydride or a mixed anhydride or an acyl halide or a thioacyl halide or an organic thioacid anhydride.

In the foregoing reaction, R.sub.1 ', R.sub.2 ' and R.sub.3 ' represent the same or different C.sub.1 -C.sub.3 alkyl, methyl, ethyl, n-propyl or i-propyl; and .theta. is chloro or bromo and one of the dashed lines in the reaction product represents a carbon-carbon double bond and each of the other dashed lines represent carbon-carbon single bonds. This reaction is carried out in the presence of an acid catalyst which may be either a Lewis acid or a mineral acid. When using Lewis acids such as boron trifluoride etherate, zinc chloride, aluminum chloride, zinc bromide, diethyl aluminum chloride, ethyl aluminum dichloride, stannic chloride or zinc bromide, the temperature of reaction may vary between 0.degree. C. and 80.degree. C., with a preferred reaction temperature of between 10.degree. C. and 50.degree. C. When using a mineral acid, such as methane sulfonic acid, sulfuric acid, phosphoric acid, polyphosphoric acid, or a mixture of methane sulfonic acid and phosphorous pentoxide, the temperature of reaction may vary between 25.degree. C. and 150.degree. C. with a preferred reaction temperature of between 40.degree. C. and 110.degree. C.

The ratio of dimer of isoamylene:acylating agent or thioacylating agent (e.g., acetic anhydride) may vary between 1:1.1 and 2:1.0 with a preferable mole ratio of diisoamylene dimer:acylating agent being about 1:0.7. Various acyl anhydrides, thioacyl anhydrides, acyl halides or thioacyl halides may be used, for example:

Acetic anhydride

Thioacetic anhydride

Propionic anhydride

Thiopropionic anhydride

n-Butyric anhydride

n-Thiobutyric anhydride

Isobutyric anhydride

Thioisobutyric anhydride

Acetic propionic anhydride

Thioacetic thiopropionic anhydride

Acetic n-butyric anhydride

Thioacetic thio-n-butyric anhydride

Acetic i-butyric anhydride

Thioacetic thio-i-butyric anhydride

Propionic i-butyric anhydride

Thiopropionic thioisobutyric anhydride

Propionic n-butyric anhydride

Thiopropionic thio-n-butyric anhydride

Acetyl chloride

Thioacetyl chloride

Acetyl bromide

Thioacetyl bromide

n-Propenyl chloride

Thio-n-propenyl chloride

n-propenyl bromide

Thio-n-propenyl bromide

n-Butyric chloride

Thio-n-butyric chloride

Isobutyric chloride

Thioisobutyric chloride

n-butyric bromide

Thio-n-butyric bromide

The concentration of catalysts in the reaction mass may vary from 2.5 weight percent to 150 weight percent with a preferred concentration (Lewis acid or mineral acid) being between 5 and 10 percent by weight of the reaction mass.

Although an inert solvent may be used in the reaction mass (e.g., benzene, toluene, xylene, dihydrochloromethane or 1,2-dichlorobenzene) it is preferred that no solvents be used and that the reaction mass be carried out in the absence of solvent.

Although pressures greater than or less than atmospheric pressure may be used, no specific advantages are seen in using higher or lower pressures insofar as conversion, yield or time of reaction is concerned.

Accordingly, it is most preferred to use atmospheric pressure as a reaction condition in the acylation or thioacylation reaction.

In carrying out the reaction whereby the ketone is reacted with the epoxide or thiirane to form the oxathiolane, dithiolane or dioxolane according to the sequence: ##STR83## or in carrying out the reaction of the ketone or thioketone with the diol, dithiol or thiol alcohol according to the reaction sequence, for example: ##STR84## This reaction is carried out in the presence of an acid catalyst which, in this case, is a Lewis acid such as boron trifluoride, boron trifluoride etherate, zinc chloride, aluminum chloride, zinc bromide, diethyl aluminum chloride, ethyl aluminum dichloride, stannic chloride or zinc bromide. The temperature of reaction may vary between 0.degree. and 80.degree. C. with a preferred reaction temperature of between 10.degree. C. and 50.degree. C.

The mole ratio of acylated or thioacylated diisoamylene having the structure: ##STR85## to epoxide or thiirane having the structure: ##STR86## or glycol, dithiol or hydroxythiol having the structure: ##STR87## may vary from 1:1 of acylated of thioacylated diisoamylene: epoxide, thiirane, glycol, dithiol or thioalcohol up to 1:2.

The following table sets forth reactants and dioxolane, oxathiolane, and dithiolane reaction products contemplated by our invention:

When a gaseous reactant is used such as thiirane having the structure: ##STR160## or ethylene oxide having the structure: ##STR161## the conditions of the reaction involve pressures substantially greater than atmospheric so that the reactant is in constant contact at whatever temperature the reaction is carried out with the other reactant. Thus, when ethylene oxide having the structure: ##STR162## is reacted with the ketone mixture having the structure: ##STR163## in order to yield the reaction product mixture having the structure: ##STR164## the reaction is preferably carried out at pressures of from about 2 up to about 10 atmospheres and temperatures of from about 50.degree. C. up to about 100.degree. C. in the presence of a Lewis acid such as stannic chloride or boron trifluoride etherate.

The individual oxathiolane, dioxolane, and dithiolane compounds of our invention can be obtained in purer form or in substantially purer form by conventional purification techniques. Thus, the product can be purified and/or isolated by distillation, extraction, crystallization, preparative chromatographic techniques and the like. It has been found desirable to purify the oxathiolane, dithiolane and dioxolane compounds by fractional distillation using vacuum.

It will be appreciated from the present disclosure that the dithiolane, oxathiolane and dioxolane compounds and mixtures thereof according to the present invention can be used to alter, vary, fortify, modify, enhance or otherwise improve the flavor of a wide variety of materials which are ingested, consumed or otherwise organoleptically sensed.

The term "alter" in its various forms will be understood herein to mean the supplying or imparting of a flavor character or note to an otherwise bland, relatively tasteless substance, or augmenting an existing flavor characteristic where the natural flavor is deficient in some regard or supplementing the existing flavor impression to modify the organoleptic character.

Such compounds are accordingly useful in flavoring compositions. A flavoring composition is taken to mean one which contributes a part of the overall flavor impression by supplementing or fortifying a natural or artificial flavor in a material or one which supplies substantially all the flavor and/or aroma character to a consumable article.

The term "enhance" is intended herein to mean the intensification of a particular aroma or taste nuance without changing the quality or nature of said nuance and without adding an additional aroma or taste nuance to the consumable material, the organoleptic properties of which are enhanced.

The term "foodstuff" as used herein includes both solid and liquid ingestable materials for man or animals which materials do, but need not, have nutritional value. Thus, foodstuffs include meats, gravies, soups, convenience foods, malt, alcoholic and other beverages, mild and dairy products, seafoods including fish, crustaceans, mollusks and the like, candies, vegetables, cereals, soft drinks, snacks, dog and cat foods, other veterinary products and the like.

As used herein, the term "medicinal product" includes both solids and liquids which are ingestible non-toxic materials which have medicinal value such as cough syrups, cough drops, aspirin and chewable medicinal tablets.

The term "chewing gum" is intended to mean a composition which comprises a substantially water-insoluble, chewable plastic gum base such as chicle, or substitutes therefor, including jelutong, guttakay, rubber or certain cosmetible natural or synthetic resins or waxes. Incorporated with the gum base in admixture therewith may be plasticizers or softening agents, e.g., glycerine; and a flavoring composition which incorporates one of the oxathiolanes, dithiolanes and dioxolanes of our invention, and in addition, sweetening agents which may be sugars, including sucrose or dextrose and/or artificial sweeteners such as cyclamates or saccharin. Other optional ingredients may also be present.

Substances suitable for use herein as co-ingredients or flavoring adjuvants are well known in the art for such use, being extensively described in the relevant literature. It is a requirement that any such material be "ingestibly" acceptable and thus non-toxic and otherwise non-deleterious particularly from an organoleptic standpoint whereby the ultimate flavor and/or aroma of the consumable material used is not caused to have unacceptable aroma and taste nuances. Such materials may in general be characterized as flavoring adjuvants or vehicles comprising broadly stabilizers, thickeners, surface active agents, conditioners, other flavorants and flavor intensifiers.

Stabilizer compounds include preservatives, e.g. sodium chloride, antioxidants, e.g., calcium and sodium ascorbate, ascorbid acid, butylated hydroxyanisole (mixture of 2- and 3-tertiary-butyl-4-hydroxyanisole), butylated hydroxytoluene (2,6-di-tertiary-butyl-4-methylphenol), propyl gallate and the like and sequestrants, e.g., citric acid.

Thickener compounds include carriers, binders, protective colloids, suspending agents, emulsifiers and the like, e.g., agar agar, carrageenan, cellulose and cellulose derivatives such as carboxymethyl cellulose and methyl cellulose; natural and synthetic gums such as gum arabic, gum tragacanth; gelatin, proteinaceous materials; lipids, carbohydrates; starches, pectins and emulsifiers, e.g., mono and diglycerides of fatty acids, skim milk powder, hexoses, pentoses, disaccharides, e.g., sucrose, corn syrup and the like.

Surface active agents include emulsifying agents, e.g., fatty acids such as capric acid, caprylic acid, palmitic acid, myristic acid and the like, mono and diglycerides of fatty acids, lecithin, defoaming and flavor-dispersing agents such as sorbitan monostearate, potassium stearate, hydrogenated tallow alcohol and the like.

Conditioners include compounds such as bleaching and maturing agents, e.g., benzoyl peroxide, calcium peroxide, hydrogen peroxide and the like; starch modifiers such as peracetic acid, sodium chlorite, sodium hypochlorite, propylene oxide, succinic anhydride and the like, buffers and neutralizing agents, e.g., sodium acetate, ammonium bicarbonate, ammonium phosphate, citric acid, lactic acid, vinegar and the like; colorants, e.g., carminic acid, cochineal, tumeric and curcuma and the like; firming agents such as aluminum sodium sulfate, calcium chloride and calcium gluconate; texturizers, anti-caking agents, e.g., aluminum calcium sulfate and tribasic calcium phosphate; enzymes; yeast foods, e.g., calcium lactate and calcium sulfate; nutrient supplements, e.g., iron salts such as ferric phosphate, ferrous gulconate and the like, riboflavin, vitamins, zinc sources such as zinc chloride, zinc sulfate and the like.

Other flavorants and flavor intensifiers include aldehydes, esters, natural oils, alcohols, sulfides, ketones, lactones, carboxylic acids and hydrocarbons such as heliotropin, terpineol-4, benzaldehyde, anisaldehyde, phenyl acetaldehyde, benzyl formate, benzyl acetate, cis-3-hexenyl benzoate, methyl hexanoate, hexanal, eucalyptol, eugenol, acetaldehyde, ethyl acetate, ethyl butyrate, turpentine gum oil, limonene, gum camphor, isobornyl acetate, borneol, cinnamic aldehyde, cuminic aldehyde, furfural, methyl cinnamate, cassia oil, vanillin, maltol, parahydroxybenzyl acetone, dimethyl sulfide, alpha-ionone, acetic acid, isobutyl acetate, acetone butyric acid, formic acid, valeric acid, amyl acetate, amyl butyrate, anethol, benzyl salicylate, diacetyl, di-methyl anthranilate, ethyl methylphenylglycidate, ethyl succinate, ethyl valerate, geraniol, cis-3-hexen-1-ol, 2-hexenyl acetate, 2-hexenyl butyrate, 4-(p-hydroxyphenyl)-2-butanone, beta-ionone, isobutyl cinnamate, jasmine, lemon essential oil, methyl butyrate, methyl caproate, methyl disolfide, methyl p-naphthyl ketone, orris butter, rose absolute, terpenyl acetate, gamma-undecalactone, vanilla and alcohol.

The specific flavoring adjuvant selected for use may be either solid or liquid depending upon the desired physical form of the ultimate product, i.e., foodstuff, wherher simulated or natural, should, in any event, (i) be organoleptically compatible with the oxathiolanes, dithiolanes and dioxolane derivatives of our invention by not covering or spoiling the organoleptic properties (aroma and/or taste) thereof; (ii) be nonreactive with the oxathiolanes, dithiolanes or dioxolane derivatives of our invention and (iii) be capable of providing an environment in which the oxathiolanes, dithiolanes or dioxolane derivatives can be dispersed or admixed to provide homogeneous medium. In addition, selection of onr or more flavoring adjuvants, as well as the quantities thereof will depend upon the precise organoleptic character desired in the finished product. Thus, in the case of flavoring compositions, ingredient selection will vary in accordance with the foodstuff, chewing gum, medicinal product or toothpaste to which the flavor and/or aroma are to be imparted, modified, altered or enhanced. In contradistinction, in the preparation of solid products, e.g., simulated foodstuffs, ingredients capable of providing normally solid compositions should be selected such as various cellulose derivatives.

As will be appreciated by those skilled in the art, the amount of oxathiolanes, dithiolanes or dioxolanes employed in a particular instance can vary over a relatively wide range, depending upon the desired organoleptic effects to be achieved. Thus, correspondingly greater amounts would be necessary in those instances wherein the ultimate food composition to be flavored is relatively bland to the taste, whereas relatively minor quantities may suffice for purposes of enhancing the composition merely deficient in natural flavor or aroma. The primary requirement is that the amount selected to be effective, i.e., sufficient to alter, modify or enhance the organoleptic characteristics of the parent composition, whether foodstuff per se, chewing gum per se, medicinal product per se, toothpaste per se, or flavoring composition.

The use of insufficient quantities of oxathiolanes, dithiolanes and dioxolane derivatives ranging from small, but effective, amount, e.g., 0.05 ppm up to about 100 ppm will, of course, substantially vitiate any possibility of obtaining the desired results while excess quantities prove needlessly costly and, in extreme cases, may disrupt the flavor-aroma balance, thus proving self defeating. Accordingly, the terminology "effective amount" and "sufficient amount" is to be accorded a significance in the context of the present invention consistent with the obtention of desired flavoring effects.

Thus, and with respect to ultimate food compositions, chewing gum compositions, medicinal product compositions and toothpaste compositions, it is found that quantities of oxathiolanes, dithiolanes and dioxolanes ranging from a small, but effective amount, e.g., 0.05 ppm up to about 100 ppm based on total composition are suitable. Concentrations in excess of the maximum quantity stated are not normally recommended, since they fail to prove commensurate enhancement of organoleptic properties. In those instances, wherein the oxathiolanes, dithiolanes and dioxolanes are added to the foodstuff as an integral component of a flavoring composition, it is, of course, essential that the total quantity of flavoring composition employed be sufficient to yield an effective oxathiolane, dithiolane and dioxolanes concentration in the foodstuff product.

Food flavoring compositions prepared in accordance with the present invention preferably contain the oxathiolanes, dithiolanes and dioxolanes in concentrations ranging from about 0.1% up to about 15% by weight based on the total weight of the said flavoring composition.

The composition described herein can be prepared according to conventional techniques well known as typified by cake batters and fruit drinks and can be formulated by merely admixing the involved ingredients within the proportions stated in a suitable blender to obtain the desired consistency, homogeneity of dispersion, etc. Alternatively, flavoring compositions in the form of particulate solids can be conveniently prepared by mixing the oxathiolanes, dithiolanes and dioxolanes with, for example, gum arabic, gum tragacanth, carrageenan and the like, and thereafter spray-drying the resultant mixture whereby to obtain the particular solid product. Pre-prepared flavor mixes in powder form, e.g., a fruit-flavored powder mix are obtained by mixing the dried solid components, e.g., starch, sugar and the like and the oxathiolanes, dithiolanes and dioxolanes in a dry blender until the requisite degree of uniformity is achieved.

It is presently preferred to combine with the oxathiolanes, dithiolanes and dioxolanes of our invention, the following adjuvants:

Heliotropin;

Terpineol-4;

Benzaldehyde;

Anisaldehyde;

Phenyl acetaldehyde;

Benzyl formate;

Benzyl acetate;

Cis-3-hexenyl benzoate;

Methyl Hexanoate;

Hexanal;

Eucalyptol;

Eugenol;

Acetaldehyde;

Ethyl acetate;

Ethyl butyrate;

Turpentine gum oil;

Limonene;

Gum camphor;

Isobornyl acetate;

Borneol;

Cinnamic aldehyde;

Cuminic aldehyde;

Furfural;

Methyl cinnamate;

Cassia oil;

Vanillin;

Maltol;

Parahydroxybenzylacetone;

Dimethyl sulfide;

Alpha-ionone;

Acetic acid;

Isobutyl acetate;

Acetone;

Butyric acid;

Formic acid;

Valeric acid;

Amyl acetate;

Amyl butyrate;

Anethol;

Benzyl salicylate;

Diacetyl;

Dimethyl anthranilate;

Ethyl methylphenylglycidate;

Ethyl succinate;

Ethyl valerate;

Geraniol;

Cis-3-hexen-1-ol;

2-Hexenyl acetate;

2-Hexenyl butyrate;

Hexyl butyrate;

4-(p-Hydroxyphenyl)-2-butanone;

Beta-ionone;

Isobutyl cinnamate;

Jasmine;

Lemon essential oil;

Methyl butyrate;

Methyl capronate;

Methyl disulfide;

Methyl p-naphthyl ketone;

Orris butter;

Rose absolute;

Terpenyl acetate;

Gamma-undecalactone;

Vanilla; and

Alcohol.

An additional aspect of our invention provides an organoleptically improved smoking tobacco product and additives therefor, as well as methods of making the same which overcome problems heretofore encountered in which specific desired sweet, woody, oriental, spicy and fruity flavor characteristics of natural "Turkish-like" tobacco (prior to smoking and on smoking in the mainstream and in the sidestream) are created or enhanced or modified or augmented and may be readily controlled and maintained at the desired uniform level regardless of variations in the tobacco components of the blend.

This invention further provides improved tobacco additives and methods whereby various desirable natural aromatic tobacco flavoring characteristics with sweet, woody, oriental type, camphoraceous, fruity and spicy, as well as peppery taste and aroma nuances may be imparted to smoking tobacco products, and may be readily varied and controlled to produce the desired uniform flavoring characteristics.

In carrying out this aspect of our invention, we add to smoking tobacco materials or a suitable substitute therefor e.g., dried lettuce leaves, an aroma and flavor additive containing as an active ingredient one or more oxathiolanes, dithiolanes and dioxolanes of our invention.

In addition to the oxathiolanes, dithiolanes and dioxolanes of our invention other flavoring and aroma additives may be added to the smoking tobacco material or substitute therefor either separately or in mixture with the oxathiolanes, dithiolanes and dioxolanes as follows:

I. Synthetic Materials

Beta-ethyl-cinnamaldehyde;

Eugenol;

Dipentene;

Damascenone;

Maltol;

Ethyl maltol;

Delta undecalactone;

Delta decalactone;

Benzaldehyde;

Amyl acetate;

Ethyl butyrate;

Ethyl valerate;

Ethyl acetate;

2-Hexenol-1;

2-Methyl-5-isopropyl-1,3-nonadiene-8-one;

2,6-Dimethyl-2,6-undecadiene-10-one;

2-Methyl-5-isopropylacetophenone;

2-Hydroxy-2,5,5,8a-tetramethyl-1-(2-hydroxyethyl)decahydronaphthalene;

Dodecahydro-3a6,6,9a-tetramethyl-naphtho-(2,1 furan

4-Hydroxyhexanoic acid, gamma lactone; and

Polyisoprenoid hydrocarbons defined in Example V of U.S. Pat. No. 3,589,372 issued on June 29, 1971.

II. Natural Oils

Celery seed oil;

Coffee extract;

Bergamot Oil;

Cocoa extract;

Nutmeg Oil; and

Origanum oil.

An aroma and flavoring concentrate containing one or more oxathiolanes, dithiolanes and dioxolanes of our invention and, if desired, one or more of the above indicated additional flavoring additives may be added to the smoking tobacco material, to the filter or to the leaf or paper wrapper. The smoking tobacco material may be shredded, cured, cased and blended tobacco material or tobacco substitutes (e.g., lettuce leaves) or mixtures thereof. The proportions of flavoring additives may be varied in accordance with taste but insofar as enhancement of the imparting of natural and/or sweet notes and/or woody notes and/or oriental-like notes and/or camphoraceous notes and/or fruity notes and/or spicy notes and/or peppery notes, we have found that satisfactory results are obtained in the proportion by weight of the sum total of oxathiolanes, dithiolanes and dioxolane derivative(s) to smoking tobacco material is between 50 ppm and 1,500 ppm (0.015%-0.15%). We have further found that satisfactory results are obtained if the proportion by weight of the sum total of oxathiolanes, dithiolanes and dioxolane derivatives used to flavoring material is between 1,500 and 15,000 ppm (0.15%-1.5%).

Any convenient method for incorporating the oxathiolanes, dithiolanes and dioxolane derivative(s) into the tobacco product may be employed. Thus, the oxathiolanes, dithiolanes and dioxolane derivative(s) taken alone or along with other flavoring additives may be dissolved in a suitable solvent such as ethanol, diethyl ether and/or volative organic solvents and the resulting solution may either be spread on the cured, cased and blended tobacco material or the tobacco material may be dipped into such solution. Under certain circumstances, a solution of the oxathiolanes, dithiolanes and dioxolane derivative(s) taken alone or taken further together with other flavoring additives as set forth above, may be applied by means of a suitable applicator such as a brush or roller on the paper or leaf wrapper for the smoking product, or it may be applied to the filter by either spraying or dipping, or coating.

Furthermore, it will be apparent that only a portion of the tobacco or substitute therefor need be treated and the thus treated tobacco may be blended with other tobaccos before the ultimate tobacco product is formed. In such cases, the tobacco treated may have the oxathiolanes, dithiolanes and dioxolane derivative(s) in excess of the amounts or concentrations above indicated so that when blended with other tobaccos, the final product will have the percentage within the indicated range.

In accordance with one specific example of our invention, an aged, cured and shredded domestic burley tobacco is sprayed with a 20% ethyl alcohol solution of the compound having the structure: ##STR165## in an amount to provide a tobacco composition containing 800 ppm by weight of said compound on a dry basis. Thereafter, the alcohol is removed by evaporation and the tobacco is manufactured into cigarettes by the usual techniques. The cigarette, when treated as indicated has a desired and pleasing aroma which is defined as woody and peppery with oriental and fruity and spicy undertones detectable in the main and the sidestreams when the cigarette is smoked. This aroma is described as being sweeter, more aromatic, more Turkish tobacco-like and having sweet, fruity, peppery, woody and oriental nuances which cause the burley tobacco to equate Turkish-like.

While our invention is particularly useful in the manufacture of smoking tobacco, such as cigarette tobacco, cigar tobacco and pipe tobacco, other tobacco products, formed from the sheeted tobacco dust or fines may also be used. Likewise, the oxathiolanes, dithiolanes and dioxolane derivative(s) of our invention can be incorporated with materials such as filter tip materials (e.g., cellulose acetate filters wherein sweet, woody, oriental, spicy and/or fruity effects are desired), seam paste, packaging materials and the like which are used along with tobacco to form a product adapted for smoking. Furthermore, the oxathiolanes, dithiolanes and dioxolane derivative(s) can be added to certain tobacco substitutes of natural or synthetic origin (e.g., dried lettuce leaves) and, accordingly, by the term "tobacco" as used throughout this specification is meant any composition intended for human consumption by smoking or otherwise, whether composed of tobacco, of tobacco plant parts, or substitute materials, or both.

The oxathiolanes, dithiolanes and dioxolane derivative(s) of our invention and one or more auxiliary perfume ingredients including, for example, hydrocarbons, alcohols, ketones, aldehydes, nitriles, esters, lactones, synthetic essential oils and/or natural essential oils may be admixed so that the combined odors of the individual components produce a pleasant and desired fragrance, particularly and preferably in the woody, patchouli-like, amber and/or cedarwood fragrances. Such perfume compositions usually contain (a) the main note or the "bouquet" or foundation stone of the composition; (b) modifiers which round off and accompany the main note; (c) fixatives which include odorous substances which lend a particular note to the perfume throughout all stages of evaporation and substances which retard evaporation; and (d) topnotes which are usually low-boiling fresh-smelling materials.

In perfume compositions, it is the individual components which contribute to their particular olfactory characteristics, however, the overall sensory effect of the perfume composition will be at least the sum total of the effects of each of the ingredients. Thus, one or more of the oxathiolanes, dithiolanes and dioxolane derivative(s) of our invention can be used to alter, modify or enhance the aroma characteristics of a perfume composition, for example, by utilizing or moderating the olfactory reaction contributed by another ingredient in the composition.

The amount of oxathiolane, dithiolane and dioxolane derivative(s) of our invention which will be effective in perfume compositions as well as in perfumed articles and colognes depends on many factors, including the other ingredients, their amounts and the effects which are desired. It has been found that perfume compositions containing as little as 0.01% of oxathiolane, dithiolane and/or dioxolane derivative(s) or even less (e.g., 0.005%) can be used to impart pleasant cedar, amber, woody, sweet, patchouli-like aromas to soaps, cosmetics, detergents (including solid or liquid anionic, cationic, nonionic and switterionic detergents) or other products. The amount employed can range up to 70% of the fragrance components and will depend on considerations of cost, nature of the end product, the effect desired on the finished product and the particular fragrance sought.

The oxathiolane, dithiolane and dioxolane derivative(s) of our invention are useful (taken alone or together with other ingredients in perfume compositions) in detergents and soaps, space odorants and deodorants, perfumes, colognes, toilet water, bath preparations, such as lacquers, brilliantines, pomades and shampoos; cosmetic preparations such as creams, deodorants, hand lotions and sun screens; powders such as talcs, dusting powders, face powders and the like. As little as 0.05% of the oxathiolane, dithiolane and/or dioxolane derivative(s) will suffice to impart a pleasant cedar, amber, sweet, patchouli-like aroma to perfumed articles which are desired to have a woody aroma. Generally no more than 3% of the oxathiolane, dithiolane and/or dioxolane derivative(s) based on the ultimate end product (e.g., the perfumed article) is required.

In addition, the perfume composition or fragrance composition of our invention can contain a vehicle or carrier for the oxathiolane, dithiolane and/or dioxolane derivative(s). The vehicle can be a liquid such as a non-toxic alcohol, a non-toxic glycol or the like. The carrier can also be an absorbent solid, such as a gum (e.g., gum arabic), or components for encapsulating the composition (such as gelatin).

It will thus be apparent that the oxathiolane, dithiolane and dioxolane derivative(s) of our invention can be utilized to alter, modify or enhance sensory properties, particularly organoleptic properties such as flavor(s) and/or fragrance(s) of a wide variety of consumable materials.

The following Example A sets forth procedures for preparing precursors of the unsaturated branched ketone precursors which are useful in producing the oxathiolanes, dithiolanes and dioxolanes of our invention.

The following Examples I-VIII set forth procedures for preparing the unsaturated branched-chain ketone precursors of the dioxolanes, oxathiolanes and dithiolanes of our invention.

The following Examples IX and X set forth procedures for preparing dioxolanes of our invention.

The remainder of the examples set forth the uses of the oxathiolanes, dioxolanes and dithiolanes of our invention for their organoleptic properties.

It will be understood that these examples are illustrative and that the invention is to be considered restricted thereto only as indicated in the appended claims.

All parts and percentages given herein are by weight unless otherwise specified.

EXAMPLE A

PREPARATION OF DI-ISOAMYLENE DERIVATIVES

Reaction: ##STR166## (wherein in each of the molecules indicated, one of the dashed lines is a carbon-carbon double bond and the other of the dashed lines are carbon-carbon single bonds).

Di-isoamylene is prepared according to one of the procedures set forth in the following references:

i-Murphy & Lane, Ind. Eng. Chem., Prod. Res. Dev., Vol. 14, No. 3, 1975 p. 167 (Title: Oligomerization of 2-Methyl-2-Butene in Sulfuric and Sulfuric-Phosphoric Acid Mixtures).

iv-U.S. Pat. No. 3,627,700, issued on Dec. 14, 1971, (Zuech).

v-U.S. Pat. No. 3,538,181, issued on Nov. 3, 1970, (Banks).

vi-U.S. Pat. No. 3,461,184, issued on Aug. 12, 1969 (Hay et al).

vii-Gurwitsch, Chemische Berichte, 1912, Vol. 2, p. 796 (Production of Di-isoamylene From Isoamylene Using Mercury Acetate Catalyst).

As an illustration, and not by way of limitation, the following example sets forth the preparation of diisoamylenes useful in producing the unsaturated branched-chain ketones which are useful in producing the fragrances, foodstuff flavor formulations, other flavor formulations and aromatized tobaccos of our invention.

EXAMPLE A-1

Over a period of ten hours, 2-methyl-2-butene is pumped through a 5'.times.5/8 (0.625 inch) tube packed with 15.0 g of polystyrene sulfonic acid catalyst, at a temperature of 100.degree. C. and at a pressure of 400 psig.

The resulting material was distilled in a fractionation column in order to separate the diisoamylene from the higher molecular weight polymers which are formed during the reaction as by-products. This material distills at 36.degree.-40.degree. C. vapor temperature; 74.degree.-94.degree. C. liquid temperature and 4-5 mm/Hg pressure. This material will be used in the syntheses in the following examples.

FIG. AA represents the GLC profile for the reaction product of Example A using a 70% sulfuric acid catalyst at 35%C.

FIG. AB represents the GLC profile for the reaction product of Example A using an Amberlyst.RTM. 15 acidic ion exchange resin catalyst at a temperature of 150.degree. C.

FIG. AC represents the GLC profile for the reaction product of Example A, using an Amberlyst.RTM. 15 catalyst at 100.degree. C.

FIG. AE represents the GLC profile for the reaction product of Example I, using a sulfuric acid catalyst, at 35.degree. C. and an alpha-methyl styrene diluent according to the conditions of United Kingdom Patent Specification 796,130 (distilled reaction product). Distillation range: 36.degree.-40.degree. C. vapor temperature; 74.degree.-94.degree. C. liquid temperature and 4-5 mm/Hg pressure.

FIG. BA represents the NMR spectrum for Peak 1 of the GLC profile of FIG. AE.

FIG. BB represents the infra-red spectrum for Peak 1 of the GLC profile of FIG. AE.

FIG. CA represents the NMR spectrum for Peak 2 of the GLC profile of FIG. AE.

FIG. CB represents the infra-red spectrum for Peak 2 of the GLC profile of FIG. AE.

FIG. D represents the NMR spectrum for Peak 2 of the GLC profile of FIG. AB.

EXAMPLE I

PREPARATION OF ACETYL DERIVATIVE OF DIISOAMYLENE

Reaction: ##STR167## wherein in each of the structures containing dashed lines, these structures represent mixtures of molecules wherein in each of the molecules, one of the dashed lines represents a carbon-carbon double bond and each of the other of the dashed lines represent carbon-carbon single bonds.

Into a 2-liter reaction flask equipped with stirrer, thermometer, reflex condenser and heating mantle, is placed 1000 g of acetic anhydride and 80 g of boron trifluoride diethyl etherate. The resulting mixture is heated to 80.degree. C. and, over a period of 40 minutes, 690 g of diisoamylene prepared according to the illustration in Example A-1, supra is added. The reaction mass is maintained at 82.degree.-85.degree. C. for a period of 5.5 hours, whereupon it is cooled to room temperature. The reaction mass is then added to one liter of water and the resulting mixture is stirred thereby yielding two phases; an organic phase and an aqueous phase. The organic phase is separated from the aqueous phase and neutralized with two liters of 12.5% sodium hydroxide followed by one liter of saturated sodium chloride solution. The resulting organic phase is then dried over anhydrous sodium sulfate and distilled in a one plate distillation column, yielding the following fractions:

The resulting material is then distilled on a multi-plate fractionation column, yielding the following fractions at the following reflux ratios:

Fractions 5-9 of the above distillation are bulked and are utilized in the following examples as a reactant.

GLC, NMR, IR and mass spectral analyses yield the information that the resulting material is a mixture of cis and trans isomers having a generic structure: ##STR168## wherein in each of the molecules, one of the dashed lines is a carbon-carbon double bond and the other of the dashed lines is a carbon-carbon single bond and, primarily, this mixture contains the molecular species (cis and trans isomers) as follows: ##STR169##

FIG. 1 sets forth the GLC profile for the reaction product of Example I, containing compounds defined according to the structure: ##STR170## wherein in each molecule of the mixture, one of the dashed lines is a carbon-carbon double bond and the other of the dashed lines are carbon-carbon single bonds.