Monoazo compound having two vinylsulfone type fiber reactive groups through triazinyl bridging group

A monoazo compound represented by the following formula in a free acid form, ##STR121## wherein D is a sulfophenyl group of the following formula in a free acid form, ##STR122## in which p is 0 or 1, or a sulfonaphthyl group of the following formula in a free acid form, ##STR123## in which any one of X.sub.1 and X.sub.2 is sulfo and the other is hydrogen, and q is 0, 1 or 2;

• R.sub.1, R.sub.2 and R.sub.3 independently of one another are each hydrogen or alkyl unsubstituted or substituted with hydroxy, cyano, C.sub.1-4 alkoxy, halogeno, carboxy, carbamoyl, C.sub.1-4 alkoxycarbonyl, C.sub.1-4 alkylcarbonyloxy, sulfo or sulfamoyl;
• B.sub.1 and B.sub.2 independently of one another are each phenylene unsubstituted or substituted with methyl, methoxy, ethyl, ethoxy, chloro, bromo, sulfo or carboxy, naphthylene unsubstituted or substituted with sulfo, or alkylene, provided that at least one of B.sub.1 and B.sub.2 is the phenylene or naphthylene;
• Y.sub.1 and Y.sub.2 independently of one another are each --CH.dbd.CH.sub.2 or --CH.sub.2 CH.sub.2 Z in which Z is a group capable of being split by the action of an alkali;
• and n is 0 or 1.