CYAN DYE-FORMING COUPLERS AND PHOTOGRAPHIC MATERIALS CONTAINING SAME

摘要

CYAN DYE-FORMING COUPLER AND PHOTOGRAPHIC MATERIALS CONTAINING SAME Novel phenolic cyan dye-forming couplers contain a p-cyanophenylureido group in the 2position and in the 5-position an acylamino substituent containing a sulfone group having bulky substituents sufficient to provide steric interaction within the coupler molecule and the dye molecule derived therefrom. The couplers are represented by the formula: wherein: R1, R2, R3 and Z are as defined in the specification. The couplers are useful in photographic emulsion.