Isothiazolazo dyes having coupling components which are free from unsaturated aliphatic radicals

Abstract

Compounds of the general formula I ##STR1## where R is substituted alkyl and K is the radical of a coupling component free from unsaturated aliphatic radicals, are very useful for dyeing cellulose esters and synthetic polyesters.

Description

The present invention relates to compounds of the general formula I ##STR2## where R is substituted alkyl and K is the radical of a coupling component free from unsaturated aliphatic radicals.

R is, in particular, C.sub.1 -C.sub.4 -alkyl which is substituted by chlorine, bromine, cyano, hydroxyl, C.sub.1 -C.sub.4 -alkoxy, phenoxy, C.sub.1 -C.sub.8 -alkoxycarbonyl or unsubstituted or substituted phenyl.

Specific examples of R are 2-chloroethyl, 2-bromoethyl, cyanomethyl, 2-cyanoethyl, 2-hydroxyethyl, 2-methoxyethyl, 2-ethoxyethyl, 2-propoxyethyl, 2-butoxyethyl, 2-phenoxyethyl, methoxycarbonylmethyl, ethoxycarbonylmethyl, 2-methoxycarbonylethyl, 2-ethoxycarbonylethyl, benzyl, phenethyl, o-, m- and p-methylbenzyl, o-, m- and p-bromobenzyl, o-, m- and p-chlorobenzyl, o-, m- and p-methoxybenzyl, o-, m- and p-ethoxybenzyl and o-, m- and p-nitrobenzyl.

The radicals of the coupling components K correspond, for example, to the formula ##STR3## where R.sup.1 is hydrogen, alkyl, aralkyl, or aryl, R.sup.2 is hydrogen or R.sup.3, R.sup.3 is unsubstituted or substituted alkyl, aralkyl or aryl, and R.sup.4 and R.sup.5 are hydrogen, alkyl, alkoxy, phenoxy, halogen, alkylsulfonylamino, dialkylaminosulfonylamino or acylamino.

Specific examples of R.sup.1, in addition to those mentioned above, are methyl, ethyl, propyl, butyl, benzyl, phenethyl, phenyl, o-, m- and p-tolyl and o-, m- and p-chlorophenyl.

Examples of R.sup.3, in addition to those mentioned above, are C.sub.1 -C.sub.6 -alkyl which may be substituted by chlorine, bromine, hydroxyl, C.sub.1 -C.sub.8 -alkoxy, phenoxy, cyano, carboxyl, C.sub.1 -C.sub.8 -alkanoyloxy, benzoyloxy, o-, m- and p-methylbenzoyloxy, o-, m- and p-chlorobenzoyloxy, C.sub.1 -C.sub.4 -alkoxyalkanoyloxy, phenoxyalkanoyloxy, C.sub.1 -C.sub.8 -alkoxycarbonyloxy, C.sub.1 -C.sub.8 -alkoxyalkoxycarbonyloxy, benzyloxycarbonyloxy, phenethyloxycarbonyloxy, phenoxyethoxycarbonyloxy, C.sub.1 -C.sub.8 -alkylaminocarbonyloxy, cyclohexylaminocarbonyloxy, phenylaminocarbonyloxy, C.sub.1 -C.sub.8 -alkoxycarbonyl, C.sub.1 -C.sub.8 -alkoxyalkoxycarbonyl, phenoxycarbonyl, benzyloxycarbonyl or phenethyloxycarbonyl, and further examples are phenyl, benzyl, phenylethyl and cyclohexyl.

Specific examples of R.sup.3 are methyl, ethyl, propyl, butyl, phenyl, hexyl, 2-chloroethyl, 2-bromoethyl, 2-cyanoethyl, 2-hydroxyethyl, 2-phenyl-2-hydroxyethyl, 2,3-dihydroxypropyl, 2-hydroxypropyl, 2-hydroxybutyl, 2-hydroxy-3-phenoxypropyl, 2-hydroxy-3-methoxypropyl, 2-hydroxy-3-butoxypropyl, 3-hydroxypropyl, 2-methoxyethyl, 2-ethoxyethyl, 2-propoxyethyl, 2-butoxyethyl, 2-phenoxyethyl, 2-phenoxypropyl, 2-acetoxyethyl, 2-propionyloxyethyl, 2-butyryloxyethyl, 2-isobutyryloxyethyl, 2-methoxymethylcarbonyloxyethyl, 2-ethoxymethylcarbonyloxyethyl, 2-phenoxymethylcarbonyloxyethyl, 2-methoxycarbonyloxyethyl, 2-ethoxycarbonyloxyethyl, 2-propoxycarbonyloxyethyl, 2-butoxycarbonyloxyethyl, 2-phenyloxycarbonyloxyethyl, 2-benzoyloxycarbonylethyl, 2-methoxyethoxycarbonyloxyethyl, 2-ethoxyethoxycarbonyloxyethyl, 2-propoxyethoxycarbonyloxyethyl, 2-butoxyethoxycarbonyloxyethyl, 2-methylaminocarbonyloxyethyl, 2-ethylaminocarbonyloxyethyl, 2-propylaminocarbonyloxyethyl, 2-butylaminocarbonyloxyethyl, 2-methoxycarbonylethyl, 2-ethoxycarbonylethyl, 2-propoxycarbonylethyl, 2-butoxycarbonylethyl, 2-phenoxycarbonylethyl, 2-benzyloxycarbonylethyl, 2-.beta.-phenylethoxycarbonylethyl, 2-methoxyethoxycarbonylethyl, 2-ethoxyethoxycarbonylethyl, 2-propoxyethoxycarbonylethyl, 2-butoxyethoxycarbonylethyl, 2-phenoxyethoxycarbonylethyl and 2-benzoylethyl.

Examples of radicals R4 and R5 are hydrogen, methyl, ethyl, propyl, bromine, chlorine, methoxy, ethoxy, phenoxy, benzyloxy, C.sub.1 -C.sub.6 -alkanoylamino, benzoylamino, C.sub.1 -C.sub.4 -alkylsulfonylamino and di-C.sub.1 -C.sub.4 -alkylaminosulfonylamino.

The compounds of the formula I may be prepared by diazotizing a diazo component of the formula ##STR4## by a conventional method, and then reacting it with a compound of the formula

H-K. Details of the reactions may be found in the Examples, wherein parts and percentages are by weight, unless stated otherwise.

The compounds of the formula I range from yellow to blue and are useful for dyeing cellulose triacetate and especially polyesters, on which they give brilliant, deeply colored dyeings having very good fastness characteristics, in particular high lightfastness. In this context, it can be advantageous to use a mixture of compounds of the formula I.

Compounds of particular importance are those of the formula Ia ##STR5## where R.sup.6 is benzyl, phenethyl, o-, m- or p-chlorobenzyl, o-, m- or p-methoxybenzyl or -ethoxybenzyl or o-, m- or p-nitrobenzyl, R.sup.7 is hydrogen, methyl, methoxy, ethoxy or chlorine, R.sup.8 is hydrogen, methyl, methoxy, chlorine, acetylamino, propionylamino, methylsulfonylamino or dimethylaminosulfonylamino, and R.sup.2 and R.sup.3 have the stated meanings.

Preferably, R.sup.2 is hydrogen or R.sup.3, R.sup.3 being methyl, ethyl, propyl, butyl, .beta.-cyanoethyl, .beta.-hydroxyethyl, C.sub.1 -C.sub.4 -alkoxycarbonylmethyl, C.sub.1 -C.sub.4 -.beta.-alkoxycarbonyloxyethyl, C.sub.1 -C.sub.4 -alkanoyloxyethyl, C.sub.1 -C.sub.4 -alkoxycarbonyloxyethyl, C.sub.1 -C.sub.4 -alkylaminocarbonyloxyethyl, phenylaminocarbonyloxyethyl, benzyl or phenethyl.

EXAMPLE 1

21.5 parts of 5-amino-3-benzyl-4-cyano-isothiazole were dissolved in 150 parts of a 3:1 glacial acetic acid/propionic acid mixture and 70 parts of 85% strength sulfuric acid, 32 parts of nitrosylsulfuric acid (11.5% of N.sub.2 O.sub.3) were added slowly at 0.degree.-5.degree. C., and the mixture was then stirred for 4 hours at 0.degree.-5.degree. C.

17.4 parts of N-cyanoethyl-N-ethylaniline were introduced into a mixture of 330 parts of water, 35 parts of concentrated hydrochloric acid and 1.7 parts of diisobutylnaphthalene-1-sulfonic acid mixture. About 400 parts of ice were added and the diazo solution was then run in slowly at 0.degree.-5.degree. C. After completion of coupling, the dye suspension obtained was heated to 60.degree. C. and filtered, and the filter cake was washed neutral with water and then dried under reduced pressure at 60.degree. C. 31.5 parts of the dye of the formula ##STR6## were obtained; the product gave very fast bluish red dyeings on polyesters.

EXAMPLE 2

A solution of 25 parts of N-benzyl-N-cyanoethyl-m-toluidine in 100 parts of dimethylformamide was introduced into a mixture of 300 parts of water, 35 parts of concentrated hydrochloric acid and 1.7 parts of diisobutylnaphthalene-1-sulfonic acid mixture. After addition of about 400 parts of ice, a diazo solution prepared as in Example 1 from 21.5 parts of 5-amino-3-benzyl-4-cyano-isothiazole was run in slowly at 0.degree.-5.degree. C. and stirring was continued until coupling was complete. The dye suspension was heated to 50.degree. C. and filtered, and the filter cake was washed neutral with water. Drying under reduced pressure at 60.degree. C. gave 47 parts of the dye of the formula ##STR7## which gave very fast bluish red dyeings on polyesters.

EXAMPLE 3

24.3 parts of 3-methylsulfonylamino-N,N-diethylaniline were dissolved in 150 parts of dimethylformamide, and the solution was added to a mixture of 300 parts of water, 35 parts of concentrated hydrochloric acid and 1.7 parts of diisobutylnaphthalene-1-sulfonic acid mixture. After addition of about 400 parts of ice, a diazo solution prepared as in Example 1 from 21.5 parts of 5-amino-3-benzyl-4-cyano-isothiazole was run in slowly at 0.degree.-5.degree. C. After completion of coupling, the dye suspension was heated to 50.degree. C. and filtered. The filter cake was washed neutral with water and dried under reduced pressure at 50.degree. C. 40.5 parts of the dye of the formula ##STR8## where obtained; the product dyed polyesters in very fast clear reddish violet hues.

EXAMPLE 4

25.0 parts of ethyl-n-propylaminocarbonyloxyethylaniline were dissolved in 20 parts of dimethylformamide and 40 parts of 32 percent strength hydrochloric acid, and the solution was added to a mixture of 300 parts of water and 1.2 parts of diisobutylnaphthalene-1-sulfonic acid mixture. After addition of 400 parts of ice, a solution prepared as in Example 1 from 21.5 parts of 5-amino-3-benzyl-4-cyanoisothiazole was run in slowly at about 0.degree. C. After completion of coupling, the dye was filtered off and washed neutral. Drying under reduced pressure at 50.degree. C. gave 42.4 parts of the dye of the formula ##STR9## which dyed polyesters in very fast clear bluish red hues.

EXAMPLE 5

33.6 parts of cyanoethyl-ethyloxyethyloxycarbonyloxyethylaniline were dissolved in 40 parts of 32% strength hydrochloric acid, and the solution was added to a mixture of 300 parts of water and 1.2 parts of diisobutylnaphthalene-1-sulfonic acid mixture. After addition of 400 parts of ice, a solution prepared as in Example 1 from 21.5 parts of 5-amino-3-benzyl-4-cyanoisothiazole was slowly added dropwise, with the temperature not exceeding 0.degree. C. After completion of coupling, the dye formed was filtered off with suction and washed neutral. Drying under reduced pressure at 50.degree. C. gave 47 parts of the dye of the formula ##STR10## which dyed polyesters in very fast clear red hues.

The dyes identified by their diazo component and coupling component in the Table which follows were obtained in a similar manner.

__________________________________________________________________________DNNKExample Hue onNo. D K polyesters__________________________________________________________________________ ##STR11## ##STR12## red 7 " ##STR13## red 8 " ##STR14## bluish red 9 " ##STR15## bluish red 10 " ##STR16## bluish red 11 " ##STR17## bluish red 12 " ##STR18## bluish red 13 " ##STR19## bluish red 14 " ##STR20## red 15 " ##STR21## red 16 " ##STR22## red 17 " ##STR23## bluish red 18 " ##STR24## violet 19 " ##STR25## bluish violet 20 " ##STR26## reddish violet 21 " ##STR27## red 22 " ##STR28## bluish red 23 " ##STR29## bluish red 24 " ##STR30## bluish red 25 " ##STR31## red 26 " ##STR32## reddish blue 27 " ##STR33## red 28 " ##STR34## red 29 " ##STR35## red 30 " ##STR36## bluish red 31 " ##STR37## yellow 32 " ##STR38## yellow 33 " ##STR39## orange 34 " ##STR40## bluish red 35 " ##STR41## red 36 " ##STR42## red 37 " ##STR43## bluish red 38 " ##STR44## bluish red 39 " ##STR45## bluish red 40 " ##STR46## red 41 " ##STR47## violet 42 " ##STR48## red 43 " ##STR49## bluish red 44 " ##STR50## bluish red 45 " ##STR51## bluish red 46 " ##STR52## red 47 " ##STR53## violet 48 " ##STR54## red 49 " ##STR55## red 50 " ##STR56## red 51 " ##STR57## bluish red 52 " ##STR58## violet 53 " ##STR59## bluish red 54 " ##STR60## violet 55 " ##STR61## violet 56 " ##STR62## violet 57 " ##STR63## bluish red 58 " ##STR64## bluish red 59 " ##STR65## red 60 " ##STR66## red 61 " ##STR67## red 62 " ##STR68## red 63 " ##STR69## red 64 " ##STR70## red 65 ##STR71## ##STR72## bluish red 66 " ##STR73## bluish red 67 " ##STR74## bluish red 68 " ##STR75## bluish red 69 " ##STR76## bluish red 70 " ##STR77## red 71 " ##STR78## bluish red 72 " ##STR79## bluish red 73 " ##STR80## red 74 " ##STR81## bluish red 75 " ##STR82## bluish red 76 " ##STR83## red 77 " ##STR84## bluish red 78 " ##STR85## bluish red__________________________________________________________________________

Claims

1. An isothiazolazo dye of the formula: ##STR86## wherein R is a C.sub.1 -C.sub.4 alkyl which is substituted by chlorine, bromine, cyano, hydroxyl, C.sub.1 -C.sub.4 -alkoxy, phenoxy, C.sub.1 -C.sub.8 -alkoxycarbonyl or an unsubstituted phenyl or a phenyl substituted by methyl, chloro, bromo, methoxy, ethoxy or nitro; and K is ##STR87## wherein R.sup.1 is hydrogen, alkyl, aralkyl, aryl or aryl substituted by chlorine, R.sup.2 is hydrogen or R.sup.3, R.sup.3 is C.sub.1 -C.sub.6 alkyl or C.sub.1 -C.sub.6 alkyl substituted by chlorine, bromine or hydroxyl, C.sub.1 -C.sub.8 alkoxy, phenoxy, cyano, carboxyl, C.sub.1 -C.sub.8 -alkanoyloxy, benzoyloxy, o-, m-, and p-methylbenzoyloxy, o-, m- and p-chlorobenzoyloxy, C.sub.1 -C.sub.4 -alkoxyalkanoyloxy, phenoxyalkanoyloxy, C.sub.1 -C.sub.8 -alkoxycarbonyloxy, C.sub.1 -C.sub.8 -alkoxyalkoxycarbonyloxy, benzyloxycarbonyloxy, phenethyloxycarbonyloxy, phenoxyethoxycarbonyloxy, C.sub.1 -C.sub.8 -alkylaminocarbonyloxy, cyclohexylaminocarbonyloxy, phenylaminocarbonyloxy, C.sub.1 -C.sub.8 -alkoxycarbonyl, C.sub.1 -C.sub.8 -alkoxyalkoxycarbonyl, phenoxycarbonyl, benzyloxycarbonyl or phenethyloxycarbonyl, or phenyl, benzyl, phenylethyl and cyclohexyl; and R.sup.4 and R.sup.5 are hydrogen, alkyl, alkoxy, phenoxy, halogen, alkylsulfonylamino, dialkylaminosulfonylamino or acylamino.

2. The isothiazolazo dye as claimed in claim 1, wherein R.sup.3 is methyl, ethyl, propyl, butyl, phenyl, hexyl, 2-chloroethyl, 2-bromoethyl, 2-cyanoethyl, 2-hydroxyethyl, 2-phenyl-2-hydroxyethyl, 2,3-dihydroxypropyl, 2-hydroxypropyl, 2-hydroxybutyl, 2-hydroxy-3-phenoxyproyl, 2-hydroxy-3-methoxypropyl, 2-hydroxy-3-butoxypropyl, 3-hydroxypropyl, 2-methoxyethyl, 2-ethoxyethyl, 2-propoxyethyl, 2-butoxyethyl, 2-phenoxyethyl, 2-phenoxypropyl, 2-acetoxyethyl, 2-propionyloxyethyl, 2-butyryloxyethyl, 2-isobutyryloxyethyl, 2-methoxymethylcarbonyloxyethyl, 2-ethoxymethylcarbonyloxyethyl, 2-phenoxymethylcarbonyloxyethyl, 2-methoxycarbonyloxyethyl, 2-ethoxycarbonyloxyethyl, 2-propoxycarbonyloxyethyl, 2-butyoxycarbonyloxyethyl, 2-phenyloxycarbonyloxyethyl, 2-benzoyloxycarbonyloxyethyl, 2-methoxyethoxycarbonyloxyethyl, 2-ethoxyethoxycarbonyloxyethyl, 2-propoxyethoxycarbonyloxyethyl, 2-butoxyethoxycarbonyloxyethyl, 2-methylaminocarbonyloxyethyl, 2-ethylaminocarbonyloxyethyl, 2-propylaminocarbonyloxyethyl, 2-butylaminocarbonyloxyethyl, 2-methoxycarbonylethyl, 2-ethoxycarbonylethyl, 2-propoxycarbonylethyl, 2-butoxycarbonylethyl, 2-phenoxycarbonylethyl, 2-benzyloxycarbonylethyl, 2-.beta.-phenylethoxycarbonylethyl, 2-methoxyethoxycarbonylethyl, 2-ethoxyethoxycarbonylethyl, 2-propoxyethoxycarbonylether, 2-butoxyethoxycarbonylethyl, 2-phenoxyethoxycarbonylethyl and 2-benzoylethyl; and R.sup.4 and R.sup.5 are hydrogen, methyl, ethyl, propyl, bromine, chlorine, methoxy, ethoxy, phenoxy, benzyloxy, C.sub.1 -C.sub.6 -alkanoylamino, benzoylamino, C.sub.1 -C.sub.4 -alkylsulfonylamino and di-C.sub.1 -C.sub.4 -alkylaminosulfonylamino.

3. The isothiazolazo dye as claimed in claim 1 having the formula: ##STR88## wherein R.sup.6 is benzyl, phenethyl, o-, m- or p-chlorobenzyl, o-, m- or p-methoxybenzyl or -ethoxybenzyl or o-, m- or p-nitrobenzyl; R.sup.7 is hydrogen, methyl, methoxy, ethoxy or chlorine; R.sup.8 is hydrogen, methyl, methoxy, ethoxy, chlorine, acetylamino, propylamino, methylsulfonylamino, or dimethylaminosulfonamino; and R.sup.2 and R.sup.3 have the stated meanings.

4. The isothiazolazo dye as claimed in claim 3, wherein R.sup.2 is hydrogen or R.sup.3, R.sup.3 being being methyl, ethyl, propyl, butyl, .beta.-cyanoethyl, .beta.-hydroxyethyl, C.sub.1 -C.sub.4 -alkoxycarbonylmethyl, C.sub.1 -C.sub.4 -.beta.-alkoxycarbonyloxyethyl, C.sub.1 -C.sub.4 -alkanoyloxyethyl, C.sub.1 -C.sub.4 -alkoxycarbonyloxyethyl, C.sub.1 -C.sub.4 -alkylaminocarbonyloxyethyl, phenylaminocarbonyloxyethyl, benzyl or phenethyl.

5. An isothiazolazo dye having the formula: ##STR89##

6. An isothiazolazo dye having the formula: ##STR90##

7. An isothiazolazo dye having the formula: ##STR91##

8. An isothiazolazo dye having the formula: ##STR92##

9. An isothiazlazo dye having the formula: ##STR93##