Azo compounds containing two 6-hydroxypyrid-2-one coupling component radicals the nitrogen atoms of which are linked by a biscationic radical

摘要

Compounds of the formula ##STR1## wherein each A is independently linear or branched C.sub.2-6 alkylene or linear or branched C.sub.3-6 alkylene substituted by hydroxy,PPeach D is independently the radical of a diazo component of the benzene, azobenzene or naphthalene series, E is a divalent radical attached to each --N.sup. R.sub.3 R.sub.4 -- radical through an aliphatic carbon atom, P Peach R.sub.1 is independently hydrogen, C.sub.1-4 alkyl, cyclohexyl, phenyl or phenyl(C.sub.1-2 alkyl),PPeach R. sub.2 is independently hydrogen, cyano, --COOR.sub.5, --CONR.sub.6 R.sub. 7 or ##STR2## wherein R.sub.5 is hydrogen, C.sub.1-4 alkyl or phenyl(C. sub.1-2 alkyl),PPeach of R.sub.6 and R.sub.7 is independently hydrogen or C.sub.1-4 alkyl,PPeach R.sub.8 is independently C.sub.1-4 alkyl, and r is 0, 1, 2 or 3,PP each R.sub.3 is independently C.sub.1-4 alkyl or C.sub.1-4 alkyl monosubstituted by halo, cyano, hydroxy or phenyl,PPeach R.sub.4 is independently hydrogen, C.sub.1-4 alkyl or C.sub.1-4 alkyl monosubstituted by halo, cyano, hydroxy or phenyl,PPeach An.sup. is a non-chromophoric anion, and n is 0, 1, 2, 3, 4, 5 or 6,PPwith the proviso that the negative charges of the An. sup. 's balance the positive charge of each cationic group of the molecule not balanced by the negative charge of an anionic group of the molecule, compositions containing them and their use for dyeing and printing hydroxy group- or nitrogen-containing organic substances.