Azo dyes whose diazo and coupling components stem from the thiazole series

Abstract

Thiazole-azo dyes of the formula ##STR1## where R.sup.1 is C.sub.1 -C.sub.12 -alkyl, which may be interrupted by oxygen atoms, phenyl, halogen, cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl,R.sup.2 is formyl, cyano, C.sub.1 -C.sub.4 -alkoxycarbonyl or a radical of the formula --CH.dbd.CX.sup.1 X.sup.2, where X.sup.1 and X.sup.2 independently of each other are cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl,R.sup.3 is C.sub.1 -C.sub.12 -alkyl, which may be interrupted by oxygen atoms or substituted by phenyl or phenoxy, C.sub.5 -C.sub.7 -cycloalkyl, substituted or unsubstituted phenyl, furyl, thienyl, C.sub.1 -C.sub.4 -alkylthienyl or pyridyl, andR.sup.4 and R.sup.5 independently of each other are C.sub.1 -C.sub.12 -alkyl, which may be interrupted by oxygen atoms and/or substituted,with the proviso that in at least one of R.sup.1, R.sup.4 and R.sup.5 the alkyl chain is interrupted by oxygen atoms, are useful for dyeing textile fibers.

Description

The present invention relates to novel thiazole-azo dyes of the formula I ##STR2## where R.sup.1 is C.sub.1 -C.sub.12 -alkyl, which may be interrupted by from 1 to 3 oxygen atoms, phenyl, halogen, cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl,

R.sup.2 is formyl, cyano, C.sub.1 -C.sub.4 -alkoxycarbonyl or a radical of the formula --CH.dbd.CX.sup.1 X.sup.2, where X.sup.1 and X.sup.2 are identical or different and each is independently of the other cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl, R.sup.3 is C.sub.1 -C.sub.12 -alkyl, which may be interrupted by from 1 to 4 oxygen atoms or substituted by phenyl or phenoxy, C.sub.5 -C.sub.7 -cycloalkyl, substituted or unsubstituted phenyl, furyl, thienyl, C.sub.1 -C.sub.4 -alkylthienyl or pyridyl, and R.sup.4 and R.sup.5 are identical or different and each is independently of the other C.sub.1 -C.sub.12 -alkyl, which may be interrupted by from 1 to 3 oxygen atoms and/or substituted by hydroxyl or phenyl, with the proviso that in at least one of R.sup.1, R.sup.4 and R.sup.5 the alkyl chain is interrupted by from 1 to 3 oxygen atoms, and to the use thereof for dyeing textile fibers.

DE-A-3 108 077 describes the dye 2-diethylamino-4-phenyl-5-(4'-chloro-5'-formylthiazol-2'-ylazo)thiazole.

DE-A-2 910 806 and JP-A-151 653/1982 disclose azo dyes where the coupling component is a thiazole derivative. Earlier patent applications EP-A-335 234 and DE-A-3 816 698 also disclose thiazole-azo dyes having a diazo component of the isothiazole series.

It is an object of the present invention to provide new azo dyes having a diazo component and a coupling component of the thiazole series which have an advantageous range of application properties.

We have found that this object is achieved by the above-defined thiazole-azo dyes of the formula I.

Any alkyl appearing in the abovementioned formula I may be either straight-chain or branched.

If substituted phenyl appears in the above-mentioned formula I, suitable substituents are for example C.sub.1 -C.sub.4 -alkyl, C.sub.1 -C.sub.4 -alkoxy, halogen, in particular chlorine or bromine, C.sub.1 -C.sub.4 -alkanoylamino and nitro.

Suitable, R.sup.1, R.sup.2, X.sup.1 and X.sup.2 are each for example methoxycarbonyl, ethoxycarbonyl, propoxycarbonyl, isopropoxycarbonyl, butoxycarbonyl or sec-butoxycarbonyl.

R.sup.2 is also for example CH.dbd.C(CN).sub.2 CH.dbd.C(CN)COOCH.sub.3, CH.dbd.C(CN)COOC.sub.2 H.sub.5, CH.dbd.C(COOCH.sub.3).sub.2 or CH.dbd.C(COOC.sub.2 H.sub.5).sub.2.

R.sup.1 is further for example, like R.sup.3, R.sup.4 and R.sup.5, methyl, ethyl, propyl, isopropyl, butyl, isobutyl, secbutyl, pentyl, isopentyl, neopentyl, tert-pentyl, hexyl, heptyl, oxtyl, 2-ethylhexyl, isooctyl, nonyl, isononyl, decyl, isodecyl, undecyl or dodecyl. (Isooctyl, isononyl and isodecyl are trivial names derived from the oxo synthesis alcohols - cf. Ullmanns Enzyklopadie der technischen Chemi, 4th edition, volume 7, pages 215 to 217, and volume 11, pages 435 and 436.)

R.sup.1 is further for example chlorine or bromine.

R.sup.3 is further for example cyclopentyl, cyclohexyl, cycloheptyl, 2-, 3- or 4-methylcyclohexyl, 2-, 3- or 4-methylphenyl, 2-, 3- or 4-methoxyphenyl, 2-, 3- or 4-chlorophenyl, 2,4-dichlorophenyl, 2-, 3- or 4-bromophenyl, 2-, 3-or 4-formylaminophenyl, 2-, 3- or 4-acetylaminophenyl, 2-, 3- or 4-nitrophenyl or 5-methylthien-2-yl.

R.sup.1, R.sup.3, R.sup.4 and R.sup.5 are each further for example 2-methoxyethyl, 2-ethoxyethyl, 2-propoxyethyl, 2-isopropoxyethyl, 2-butoxyethyl, 2- or 3-methoxypropyl, 2- or 3-ethoxypropyl, 2- or 3-propoxypropyl, 2- or 3-butoxypropyl, 2- or 4-methoxybutyl, 2- or 4-ethoxybutyl, 2- or 4-propoxybutyl, 3,6-dioxaheptyl, 3,6-dioxaoctyl, 4,8-dioxanonyl, 3,7-dioxaoctyl, 3,7-dioxanonyl, 4,7-dioxaoctyl, 4,7-dioxanonyl, 2- or 4-butoxybutyl, 4,8-dioxadecyl, 3,6,9-trioxadecyl or 3,6,9-trioxaundecyl.

R.sup.3, R.sup.4 and R.sup.5 are each further for example benzyl or 1- or 2-phenylethyl.

R.sup.4 and R.sup.5 are each further for example 2-hydroxyethyl, 2- or 3-hydroxypropyl or 2- or 4-hydroxybutyl.

R.sup.3 is further for example 2-phenoxybutyl, 3,6,9,12-tetraoxatridecyl or 3,6,9,12-tetraoxatetradecyl.

Preference is given to thiazole-azo dyes of the formula I where R.sup.4 and R.sup.5 are each independently of each other C.sub.1 -C.sub.6 alkyl which may be interrupted by 1 or 2 oxygen atoms.

Particular preference is given to those thiazoleazo dyes of the formula I where R.sup.4 is different than R.sup.5.

The thiazole-azo dyes according to the present invention are prepared in a conventional manner. For example, a 2-aminothiazole of the formula II ##STR3## where R.sup.1 and R.sup.2 are each as defined above, can be diazotized and coupled with a thiazole of the formula III ##STR4## where R.sup.4, R.sup.4 and R.sup.5 are each as defined above.

2-Aminothiazoles of the formula II are already known and described for example in US-A-4 395 544, or can be obtained in a similar manner to that described therein.

The thiazoles of the formula III are in general likewise known compounds. They are described for example in US-A-3 770 719 and in J.V. Metzger, Heterocyclic Compounds - Thiazole and its Derivatives, vol. 34, part 1, Interscience Publ., John Wiley, New York, 1979, or can be obtained by methods similar to those described therein.

Further details of the preparation of the dyes according to the present invention may be found in the Examples.

In general, those thiazole-azo dyes of the formula I where R.sup.4 and R.sup.5 together have four or more oxygen atoms are liquid at room temperature.

The novel thiazole-azo dyes of the formula I are advantageously used as disperse dyes for dyeing textile fibers, in particular cellulose esters or polyesters, and also polyamides or blends of polyesters and cellulose fibers.

The dyeings obtained have good fastness properties, in particular good light fastness. The novel dyes have good migration properties.

The Examples which follow further illustrate the invention.

EXAMPLE 1

16.25 g of 2-amino-4-chloro-5-formylthiazole were sprinkled into a mixture of 110 g of 90% strength by weight sulfuric acid, 17 g of glacial acetic acid and 32 g of 45% strength by weight nitrosyl sulfuric acid at 0.degree.-3.degree. C. The resulting solution was stirred at from -2.degree. to 0.degree. C. for 3.5 hours. The diazonium salt solution was then added to a 0.degree. C. solution of 24 g of the coupling component of the formula ##STR5## in 200 ml of glacial acetic acid, 50 ml of propionic acid and 1 g of urea. During the addition of the diazonium salt solution, 70 g of sodium acetate were added at the same time while the temperature was maintained at <5.degree. C. The coupling reaction, which proceeds even in strongly acidic solution, was complete within a few minutes. The resulting dye of the formula ##STR6## was filtered off with suction, washed and dried. 35 g were obtained of a bluish black, resinous dye which gives a reddish blue solution in N,N-dimethylformamide and dyes polyester fabric in bright reddish blue or navy shades. The absorption maximum of the dye, dissolved in 9:1 v/v N,N-dimethylformamide/glacial acetic acid, is 582 nm. The dyeings on polyester fabric are notable for very good light fastness, even in pale shades.

EXAMPLE 2

16.25 g of 2-amino-4-chloro-5-formylthiazole were diazotized as described in Example 1 and reacted with 24 g of the coupling component of the formula ##STR7## 31 g were obtained of a bluish green dye (absorption maximum 609 nm), which dyes polyester fabric in very light-fast greenish blue shades. The dye has the formula ##STR8##

EXAMPLE 3

Example 1 was repeated, except that the coupling component used was the furan derivative of the formula ##STR9## affording the greenish blue dye of the formula ##STR10## .lambda..sub.max : 606 nm.

The same method was used to obtain the dyes of the formula ##STR11## listed in the following Table:

__________________________________________________________________________ExampleNo. R.sup.3 R.sup.4 R.sup.5 Hue__________________________________________________________________________ 4 C.sub.6 H.sub.5 C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 reddish blue 5 C.sub.6 H.sub.5 C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 reddish blue 6 C.sub.6 H.sub.5 C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 reddish blue 7 C.sub.6 H.sub.5 C.sub.3 H.sub.7 (n) C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 reddish blue 8 C.sub.6 H.sub.5 C.sub.3 H.sub.7 (n) C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OC.sub.2 reddish blue 9 C.sub.6 H.sub.5 C.sub.3 H.sub.7 (n) C.sub.3 H.sub.6 OCH.sub.3 reddish blue10 C.sub.6 H.sub.5 C.sub.3 H.sub.7 (i) C.sub.3 H.sub.6 OCH.sub.3 reddish blue11 C.sub.6 H.sub.5 C.sub.3 H.sub.7 (i) C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 reddish blue12 C.sub.6 H.sub.5 C.sub.2 H.sub.5 C.sub.2 H.sub.4 OC.sub.2 H.sub.4 OC.sub.2 reddish blue13 C.sub.6 H.sub.5 C.sub.2 H.sub.5 C.sub.2 H.sub.4 OCH.sub.3 reddish blue14 C.sub.6 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 C.sub.3 H.sub.6 OCH.sub.3 reddish blue15 C.sub.6 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 reddish blue16 ##STR12## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 reddish blue17 ##STR13## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 blue18 ##STR14## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 blue19 ##STR15## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 bluish green20 ##STR16## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 bluish green21 ##STR17## C.sub.2 H.sub.5 C.sub.2 H.sub.4 OC.sub.2 H.sub.5 bluish green22 ##STR18## C.sub.3 H.sub.7 (n) C.sub.3 H.sub.6 OCH.sub.3 bluish green23 ##STR19## C.sub.3 H.sub.7 (n) C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 bluish green24 ##STR20## C.sub.3 H.sub.7 (i) C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 bluish green25 ##STR21## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 bluish green26 ##STR22## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 reddish blue27 ##STR23## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 reddish blue28 ##STR24## C.sub.3 H.sub.7 (i) C.sub.3 H.sub.6 OCH.sub.3 reddish blue29 ##STR25## C.sub.3 H.sub.7 (n) C.sub.3 H.sub.6 OCH.sub.3 reddish blue30 ##STR26## C.sub.3 H.sub.7 (n) C.sub.2 H.sub.4 OCH.sub.3 reddish blue31 ##STR27## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 reddish blue32 ##STR28## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OC.sub.2 reddish blue33 ##STR29## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OC.sub.2 bluish green34 ##STR30## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 bluish green35 ##STR31## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 bluish green36 ##STR32## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 bluish green37 ##STR33## C.sub.3 H.sub.7 (n) C.sub.3 H.sub.6 OCH.sub.3 bluish green38 ##STR34## C.sub.3 H.sub.6 OCH.sub.3 C.sub.3 H.sub.6 OCH.sub.3 bluish green39 ##STR35## C.sub.3 H.sub.6 OCH.sub.3 C.sub.2 H.sub.5 reddish blue40 ##STR36## C.sub.2 H.sub.4 OCH.sub.3 C.sub.2 H.sub.4 OCH.sub.3 dull bluish red41 ##STR37## C.sub.2 H.sub.5 C.sub.2 H.sub.4 OCH.sub.3 dull bluish red42 ##STR38## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 dull bluish red43 ##STR39## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.5 dull bluish red44 ##STR40## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 dull bluish red45 ##STR41## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OC.sub.2 dull bluish red46 ##STR42## C.sub.3 H.sub.7 (n) C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OC.sub.2 dull bluish red47 ##STR43## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 dull bluish red48 C.sub.6 H.sub.5 OCH.sub.2 C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 dull bluish red49 C.sub.6 H.sub.5 OCH.sub.2 C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 dull bluish red50 ##STR44## C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 dull bluish red51 C.sub.6 H.sub.5 CH.sub.2 C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub. 2 H.sub.4 OCH.sub.3 dull bluish red52 C.sub.6 H.sub.5 CH.sub.2 C.sub.2 H.sub.5 C.sub.3 H.sub.6 OCH.sub.3 dull bluish red53 C.sub.6 H.sub.5 CH.sub.2 C.sub.2 H.sub.5 C.sub.3 H.sub.6 OC.sub.2 H.sub.4 OCH.sub.3 dull bluish red54 C.sub.6 H.sub.5 C.sub.2 H.sub.4 OCH.sub.3 CH.sub.2 CH.sub.2 C.sub.6 H.sub.5 blue__________________________________________________________________________

Claims

1. A thiazole-azo dye of the formula I ##STR45## where R.sup.1 is C.sub.1 -C.sub.12 -alkyl, which may be interrupted by from 1 to 3 oxygen atoms, phenyl, halogen, cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl, R.sup.2 is formyl, cyano, C.sub.1 -C.sub.4 -alkoxycarbonyl or a radical of the formula --CH.dbd.CX.sup.1 X.sup.2, where X.sup.1 and X.sup.2 are identical or different and each is independently of the other cyano or C.sub.1 -C.sub.4 -alkoxycarbonyl,

R.sup.3 is C.sub.1 -C.sub.12 -alkyl, which may be interrupted by from 1 to 4 oxygen atoms or substituted by phenyl or phenoxy, C.sub.5 -C.sub.7 -cycloalkyl, unsubstituted phenyl, furyl, thienyl, C.sub.1 -C.sub.4 -alkylthienyl or pyridyl, and

R.sup.4 and R.sup.5 are identical or different and each is independently of the other C.sub.1 -C.sub.12 -alkyl, which may be interrupted by from 1 to 3 oxygen atoms and substituted by hydroxyl or phenyl or substituted by hydroxyl or phenyl with the proviso that in at least one of R.sup.1 R.sup.4 and R.sup.5 the alkyl chain is interrupted by from 1 to 3 oxygen atoms.

2. A thiazole-azo dye as claimed in claim 1, wherein R.sup.4 and R.sup.5 are each independently of the other C.sub.1 -C.sub.6 -alkyl which may be interrupted by 1 or 2 oxygen atoms.