Defeng Zhao

Dyes based on 5,10-dihydrophenophosphazine. Part 1: disazo direct dyes

The synthesis of 2,8-diamino-5,10-dihydro-10-hydroxy-5-methylphenophosphazine 10-oxide as a possible replacement for the benzidine moiety in some disazo dyes and the use of this new diamine in the preparation of direct dyes were undertaken. The dyes obtained were applied to cotton to give purple to brilliant blue shades, and their structures were confirmed using negative ion electrospray mass spectrometry.

Trisazo Direct Black dyes based on nonmutagenic 3,3'-disubstituted benzidines

Abstract Using 3,3′-di-n-propoxybenzidine, 3,3′-di-n-butoxybenzidine and 3,3′-di-(β-hydroxyethoxy)-benzidine as diazo components, and 2,4-diamino-n-propoxybenzene, 2,4-diamino-n-butoxybenzene and 2,4-diaminophenyl-β-hydroxyethyl ether as coupling components, a series of new black trisazo dyes were prepared as homologues of C.I. Direct Black 38. Assessment of the resultant dyes indicated that their color and the dyeing properties were comparable or slightly better than the properties of C.I. Direct Black 38.