Heterocyclic azo dyes with couplers having sulfoaralkyl groups

A compound of the formula:

• ##STR74## wherein the thiophen-2-yl radical is unsubstituted or substituted with 1-3 groups selected from alkyl, cyano, alkoxycarbonyl, alkanoyl, alkylsulfonyl, arylsulfonyl, carbamoyl, alkylcarbamoyl, aryl, halogen, sulfamoyl, alkylsulfamoyl, and formyl;
• the coupler C is selected from ##STR75## wherein each R.sub.1 and Z is selected independently from alkyl, alkoxy, alkenyl of 2-6 carbons, halogen, alkanoylamino, and alkylthio;
• R.sub.2 is selected from hydrogen, alkyl, alkenyl of 2-6 carbons, aryl, cycloalkyl, and ##STR76## R.sub.3 and R.sub.4 are each selected from hydrogen and alkyl;
• M is H.sup.+, Na.sup.+, K.sup.+, or NH.sub.4.sup.+ ;
• n is 1-6;
• and m is 0, 1 or 2;
• and wherein all of the above defined alkyl, alkoxy, alkylene, alkenyl and cyclic moieties in the definitions of R.sub.1, R.sub.2 and Z are unsubstituted or substituted with 1-3 substituents selected from hydroxy, alkoxy, aryl, aryloxy, cyclohexyl, furyl, alkylcyclohexyl, aroyloxy, alkoxycarbonyl, alkanoyloxy, sulfamoyl, SO.sub.2 NH(aryl), SO.sub.2 NH(alkyl), SO.sub.2 N(dialkyl), NHCOO(alkyl), NHCONH(alkyl), alkanoylamino, alkylsulfonamido, succinimido, glutarimido, phthalimido, 2-pyrrolidono, cyano, carbamoyl, alkylcarbamoyl, alkoxyalkoxy, alkylthio, halogen, arylthio, alkylsulfonyl and arylsulfonyl.