Dyes based on 5,10-dihydrophenophosphazine. Part I: Disazo direct dyes

The synthesis of 2,8-diamino-5,10-dihydro-10-hydroxy-5-methylphenophosphazi ne 10-oxide as a possible replacement for the benzidine moiety in some disa zo dyes and the use of this new diamine in the preparation of direct dyes w ere undertaken. The dyes obtained were applied to cotton to give purple to brilliant blue shades, and their structures were confirmed using negative i on electrospray mass spectrometry. (C) 2000 Elsevier Science Ltd. All right s reserved.