Indole-Containing Disazo Dyestuffs Having a Sulfatoalkyleneoxy-Substituent

In the examples which follow, the parts denote parts by weight and the percentages denote percentages by weight.

23.3 parts of the acid sulphuric acid ester of ethylene glycol-(4-aminophenyl)-ether are diazotised in a known manner in an aqueous solution containing hydrochloric acid and the product is coupled with 22 parts of m-toluidine-methanesulphonic acid at pH 3-3.5. After completion of the coupling, the coupling solution is mixed with 4% strength sodium hydroxide solution, and heated at the boil for 11/2 - 2 hours, in order to split off the methanesulphonic acid radical. The aminoazo dyestuff thus formed is precipitated at pH 7.5 by neutralisation with hydrochloric acid, 15% strength sodium chloride being added to complete its separation, and is isolated. The monoazo dyestuff is again stirred up with 300 parts of water and 30 parts of concentrated hydrochloric acid and is thereafter further diazotised with 6.9 parts of sodium nitrite (as a 30% strength aqueous solution) at 25.degree.-30.degree.C. The suspension of the diazonium salt is thereafter run into a solution of 20.7 parts of 1-methyl-2-phenyl-indole in glacial acetic acid. The mixture is buffered somewhat with sodium acetate. After completion of coupling, the dyestuff is isolated in the usual manner, and dried. The dyestuff corresponds to the formula ##SPC14##

It dyes polyamide, from a weakly acid or neutral bath, in strongly yellowish-tinged orange shades. The dyeings show good fastness properties.

0.1 g of the dyestuff are dissolved in 100 ml of hot water, 5 ml of 10% strength ammonium acetate solution are added and the mixture is diluted to a volume of 500 ml with water. 10 g of polyamide fibre are introduced into the dyebath, the dyebath is raised to the boil over the course of 20 minutes, 4 ml of 10% strength acetic acid are added and the mixture is kept at the boil for one hour. The fibre is then rinsed and dried at 70.degree.-80.degree.C.

15.3 parts of ethylene glycol-(4-aminophenyl)-ether are diazotised in hydrochloric acid solution in a known manner and coupled with 22 parts of m-toluidinemethane-sulphonic acid, as described in Example 1. After completion of coupling, the coupling solution is treated with 4% strength sodium hydroxide solution and the mixture is stirred for half an hour at 50.degree.C. The monoazo dyestuff which has precipitated is filtered off, stirred up with 300 parts of water and 30 parts of hydrochloric acid and diazotised at 20.degree.-25.degree.C with 6.9 parts of sodium nitrite (as a 30% strength aqueous solution). The brown diazonium salt solution is filtered and allowed to run into a solution of 19.3 parts of 2-phenyl-indole in glacial acetic acid. The mixture is slightly buffered with sodium acetate. After coupling, the dyestuff of the formula ##SPC15##

is isolated in the usual manner, dried and inroduced into 300 parts of concentrated sulphuric acid at 20.degree.-25.degree.C over the course of approx. 30 minutes. The sulphuric acid solution is stirred for a further 3 hours at room temperature and is then poured out onto sufficient ice for the temperature of the mixture not to exceed 10.degree.C. The dyestuff of the formula ##SPC16##

which has precipitated is filtered off and washed copiously with water until free of acid. It dyes polyamide in reddish-tinged orange shades having good fastness properties.

15.3 parts of ethylene glycol-(4-aminophenyl)-ether are diazotised as described in Example 4 and coupled, at pH 3-3.5, with a solution, buffered with sodium acetate, of 14 parts of 3-amino-4-methoxy-toluene in approx. 200 parts of dilute hydrochloric acid, whilst keeping the pH-value of the coupling solution at pH 3-3.5 by means of sodium acetate solution. After completion of coupling, the aminoazo dyestuff is filtered off, dried and introduced into 200 parts of concentrated sulphuric acid at 20.degree.-25.degree.C over the course of approx. 30 minutes. The mixture is stirred for a further 3 hours and is poured out onto sufficient ice for the temperature of the mixture not to exceed 10.degree.C. The dyestuff of the formula ##SPC17##

which has precipitated is isolated, stirred up with approx. 300 parts of water and 30 parts of concentrated hydrochloric acid and diazotised at 25.degree.-30.degree.C with 6.9 parts of sodium nitrite (as a 30% strength aqueous solution). The suspension of the diazonium salt is run into a solution of 19.3 parts of 2-phenyl-indole in glacial acetic acid. The mixture is somewhat buffered with sodium acetate. After completion of coupling, the dyestuff of the formula ##SPC18##

is isolated in the usual manner and dried. The dyestuff dyes polyamide in bluish-tinged red shades.

23.3 parts of the acid sulphuric acid ester of ethylene glycol-(4-aminophenyl)-ether are diazotised as described in Example 1, and the product is coupled to 14 parts of 3-amino-4-methoxy-toluene, as described in Example 5. After completion of coupling, the monoazo dyestuff is isolated and further diazotised as described in Example 3. The suspension of the diazonium salt is run into a solution of 20.7 parts of 1-methyl2-phenyl-indole in glacial acetic acid. The mixture is buffered somewhat with sodium acetate. After completion of coupling, the dyestuff of the formula ##SPC19##

is isolated and dried in the usual manner. The dyestuff dyes polyamide in red shades.

26.75 parts of the acid sulphuric acid ester of ethylene glycol-(2-chloro-4-aminophenyl)-ether are diazotised in a known manner in an aqueous solution containing hydrochloric acid, the product is coupled to 14 parts of 3-amino-4-methoxy-toluene as described in Example 3, and this product is further diazotised and coupled to 19.3 parts of 2-phenyl-indole as described in Example 3. The resulting dyestuff corresponds to the formula ##SPC20##

and dyes polyamide materials in bluish-tinged red shades.

28.15 parts of the acid sulphuric acid ester of trimethylene glycol-(2-chloro-4-aminophenyl)-ether are diazotised as described in Example 5, the product is coupled to 14 parts of 3-amino-4-methoxytoluene and the new product is further diazotised and coupled to 19.3 parts of 2-phenylindole as described in Example 3. The dyestuff thus obtained corresponds to the formula ##SPC21##

and dyes polyamide materials in bluish-tinged red shades of good fastness properties.

28.15 parts of the acid sulphuric acid ester of propylene glycol-(2-chloro-4-aminophenyl)-ether are diazotised as described in Example 5, the product is coupled to 14 parts of 3-amino-4-methoxy-toluene, and the new product is diazotised further and coupled to 19.3 parts of 2-phenyl-indole, as described in Example 3. The resulting dyestuff has the formula ##SPC22##

and dyes polyamide materials in bluish-tinged red shades of good fastness properties.

26.75 parts of the acid sulphuric acid ester of ethylene glycol-(3-chloro-4-aminophenyl)-ether are diazotised in the usual manner in an aqueous solution containing hydrochloric acid, the product is coupled to 22 parts of m-toluidinemethanesulphonic acid, as described in Example 1, the methanesulphonic acid radical is split off and the product is diazotised further. The suspension of the diazonium salt is run into a solution of 20.7 parts of 1-methyl-2-phenyl-indole in glacial acetic acid. The mixture is slightly buffered with sodium acetate. After completion of coupling, the dyestuff of the formula ##SPC23##

is isolated in the usual manner and dried. The dyestuff dyes polyamide in yellowish-tinged orange shades.

24.7 parts of the acid sulphuric acid ester of ethylene glycol-(3-methyl-4-aminophenyl)-ether are diazotised as described in Example 1, the product is coupled to 19.5 parts of aniline-methanesulphonic acid, the methane-sulphonic acid radical is split off and the product is diazotised further. The final coupling takes place under the same conditions as described in Example 1, to 20.7 parts of 1-methyl-2-phenyl-indole. A dyestuff of the formula ##SPC24##

is obtained, which dyes polyamide in yellowish-tinged orange shades.

If the procedure indicated in the preceding examples is followed and the starting components, middle components and terminal components indicated in the table below are used, further disazo dyestuffs of the general formula (I) are obtained.

If instead of the acid sulphuric acid ester of ethylene glycol-(4-aminophenyl)-ether, the acid sulphuric acid esters of ethylene glycol-(2-chloro-4-aminophenyl)- ether, -(3-chloro-4-aminophenyl)-ether, -(2,6-dichloro-4-aminophenyl)-ether, -(2,3-dichloro-4-amino-phenyl)-ether, -(2,5-dichloro-4-aminophenyl)-ether, -(3,5-dichloro-4-aminophenyl)-ether, -(2,3,5-trichloro-4-aminophenyl)-ether, -(2,3,6-trichloro-4-aminophenyl)-ether, -(2,3,5,6-tetrachloro-4-aminophenyl)-ether, -(2-bromo-4-aminophenyl)-ether, -(3-bromo-4-aminophenyl)-ether, -(2-methoxy-4-amino-phenyl)-ether, -(3-methoxy-4-aminophenyl)-ether, -(3-ethoxy-4-aminophenyl)-ether, -(2-ethyl-4-aminophenyl)-ether, -(3-ethyl-4-aminophenyl)-ether, -(2-chloro-5-methoxy-4-aminophenyl)-ether, -(2-methyl-4-amino-phenyl)-ether, or -(3-methyl-4-aminophenyl)-ether are used, aniline, m-toluidine, 3-amino-4-methoxytoluene, 2-amino-toluene, 2-amino-ethylbenzene, 3-amino-ethylbenzene, 3-chloroaniline, 3-bromoaniline, 2-aminoanisole, 3-aminoanisole, 2-aminoethoxybenzene, 3-aminoethoxybenzene, 1-amino-2,3-dimethylbenzene, 1-amino-2,5-dimethylbenzene, 1-amino-3,5-dimethylbenzene, 2-amino- 4-methoxy-toluene, 2-amino-1,4-dimethoxybenzene, 2-amino-4-ethoxytoluene, 2-amino-1,4-diethoxybenzene or .alpha.-naphthylamine are used as the middle components and the terminal components used are those indicated in the preceding table, dyestuffs which dye polyamide in orange, red and ruby shades are again obtained.

Instead of the acid sulphuric acid esters of ethylene glycol, the acid sulphuric acid esters of trimethylene glycol and propylene glycol can also be used.