Azo dyestuffs having a carboxyl group and a substituted sulfonylimino group in the coupling component

Claim 1

A dyestuff of the formula ##STR44## in which D is a diazo component radical selected from the group consisting of thiazolyl which is unsubstituted or substituted by chloro, bromo, nitro, cyano, thiocyano, lower alkyl, lower aralkyl, phenyl, lower cyanoalkyl, lower alkoxy, lower alkoxycarbonyl, trifluoromethyl, lower alkylcarbonyl or lower alkylsulfonyl; benzthiazole which is unsubstituted or substituted by chloro, bromo, cyano, thiocyano, lower alkyl, lower alkoxy, lower aralkoxy, phenyl, lower alkylmercapto, lower alkylsulfonyl, trifluoromethyl, nitro, cyanoethylsulfonyl, aminosulfonyl, monoalkylated aminosulfonyl, dialkylated aminosulfonyl, or lower alkoxycarbonyl; pyrazole which is unsubstituted or substituted by cyano, lower alkyl, lower alkoxy, lower alkoxycarbonyl or phenyl; thiadiazolyl which is unsubstituted or substituted by chloro, bromo, lower alkoxy, alkylmercapto, lower alkyl, lower alkylsulfonyl, phenyl, methylthiophenyl, nitrophenyl, tolyl, chlorophenyl or bromophenyl; imidazolyl which is unsubstituted or substituted by nitro or lower alkyl; thienyl which is unsubstituted or substituted by nitro, lower alkoxycarbonyl, lower alkyl, lower alkylsulfonyl, acetyl, aminosulfonyl or alkylated aminosulfonyl; isothiazolyl which is unsubstituted or substituted by alkyl, phenyl or cyano; benzisothiazolyl which is unsubstituted or substituted by lower alkyl, nitro, bromo or chloro; and pyridyl which is substituted by lower alkyl, cyano, bromo or chloro; d is hydrogen, chloro, lower alkyl, lower alkoxy, lower alkylmercapto, aryl, aryloxy or arylmercapto; R 1 is C 1 -C 5 alkyl which is unsubstituted or substituted by chloro, bromo, hydroxy, phenoxy, phenyl, cyano, C 1 -C 4 -alkoxy, formylamino, C 1 -C 4 -alkylcarboxyloxy, C 1 -C 4 -alkylcarbamoyloxy, phenylcarbamoyloxy, C 1 -C 3 -alkoxycarbamoyloxy, benzoyloxy, phenoxycarbonyloxy or benzoyloxy; R 2 is straight or branched chain alkylene of 1 to 4 carbon atoms; and R is C 1 -C 5 alkyl or a group of the formula ##STR45## where R 3 and R 4 are C 1 -C 5 alkyl, or R 3 and R 4 together with the nitrogen to which they are attached, represent morpholino or piperidino.