Two novel DAR yellow couplers in which there is cyclic acylphenylhydrazine as the development accelerating group, and 6-aminobenzimidazole or phenylthioltriogenazole as the adsorption group were synthesized, and the yield was 60.

With [5-mercapto-(1, 3, 4) thiadiazol-2-yl-thio]-acetic acid adopted as the adsorption group and trifluoro-acetic acid 2-( 4-amino-phenyl )-hydrazide as the strengthen groups respectively, a novel colorless DAR (A ) coupler was synthesized from N,N'-bis-(2-chloro-5-n-dodecyloxy-carbonyl) phenylmalonamide.

Admicelles and Admicellar Catalysis;