Colour coupler for photography - contg aromatic n gp

摘要

Colour former for photographic image prodn. of formula: (Coup)-N(R)-Ar-X (where Coup = pyrazolone, pyrazolotriazol, open chain ketomethylene, or phenolic coupler opt. substd. with (D) an aromatic Ag halide developer cpd.; Ar = 6-20C aryl, X = opt. substd. hydroxy, amino, or alkylamino gp; R = carbonyl contg. gp. (where D is present) or H.