DIPHENYLIMIDAZOLE DYE HAVING EXCELLENT SPECTRAL ABSORPTION CHARACTERISTIC

摘要

NEW MATERIAL:A compound of formula I or II [R1 and R2 are (substituted) alkyl or R1 and R2 together from a 5-6-membered ring; R3-R6 are halogen, (substituted)alkyl or (substituted)alkoxy; R7 and R8 are univalent organic group; n and m are 0-5]. EXAMPLE:The compound of formula III. USE:Dye for forming colored image or filter. It has low pH dependency, is usable without necessitating a mordant and has more preferably spectral absorption characteristic as a cyan pigment and excellent light resistance. PREPARATION:A coupler of formula IV or V and a p-phenylenediamine main developing agent of formula VI are subjected to oxidative coupling reaction in the presence of an oxidizing agent.