Disazo and trisazo intermediates for polyazo dyes containing a stilbenyl or 2,2'-disulfostilbenyl radical

Abstract

Disclosed are compounds of the formula, ##STR1## wherein THE X's are the same and are hydrogen or --SO.sub.3 M, Y is hydrogen, C.sub.1-4 alkyl, C.sub.1-4 alkoxy, hydroxy, halogen, --COOM or --SO.sub.3 M, K.sub.1 and K.sub.2 are the same or different and are both radicals of a coupling component, Either A.sub.1 is --SO.sub.3 M and one of B.sub.1 and C.sub.1 is --SO.sub.3 M, the other being hydrogen, Or A.sub.1 and C.sub.1 are both hydrogen and B.sub.1 is --SO.sub.3 M, and M is hydrogen or a non-chromophoric cation, their production and use in dyeing anionic dyeable substrates, for example, natural and regenerated cellulose, natural and synthetic polyamides, polyurethanes, polypropylene modified to contain basic groups, anodized aluminum, paper and, particularly, leather. The dyes are well-soluble in water, possess good resistance to acid, have relatively high substantivity especially to paper and leather and give good penetration dyeings with leather. Compounds of the formula ##STR2## wherein Q is --NH.sub.2, --NO.sub.2, acylamino or K.sub.3 --N.dbd.N--, wherein K.sub.3 is a coupling component radical free of diazotizable amino groups, Q is --NH.sub.2, --NO.sub.2, acylamino or --N.dbd.N--K.sub.4, wherein K.sub.4 is a coupling component radical free of diazotizable amino groups, with the proviso that when Q is K.sub.3 --N.dbd.N--, Q' is amino, nitro or acylamino, and A.sub.1, b.sub.1, c.sub.1, each X and Y are as defined above, are useful as intermediates in the synthesis of the polyazo compounds.

Dependencies are inferred from the claim text.