New N-Maleyl-amino-azo-naphthol-sulphonic acids, for reactive dye prepn

摘要

N-Maleyl-substd. amino-2-phenyl- or -naphthyl-azo-l-naphthol-3-sulphonic acids of formula (I) are new. m = 0 or 1; A = a benzene or naphthalene deriv. of formula (IIA) or (IIB); R1,R2 = H, halogen, 1-4C alkyl, 1-4C alkyl or an arylazo gp., opt. substd. by halogen, 1-4C alkyl, 1-4C alkoxy or SO3H, esp. sulpho-phenylazo; n, o, p = 0 or 1. Also claimed is a method of preparing reactive azo dyes from (I).