| abstract |
A monoazo compound represented by the following formula in a free acid form, ##STR1## wherein D is a sulfophenyl or sulfonaphthyl, R 1 , R 2 and R 3 are independently hydrogen or alkyl; B 1 and B 2 are independently phenylene, naphthylene, or alkylene, provided that at least one of B 1 and B 2 is phenylene or naphthylene, Y 1 and Y 2 are independently vinyl or --CH 2 CH 2 Z in which Z is splittable by the action of an alkali, and n is 0 or 1, and the monoazo compound is useful for dyeing or printing fiber materials to obtain dyed or printed products of extremely deep scarlet color excellent in various fastness with superior build-up property. |