SYNTHESIS AND USE OF NOVEL PYRAZOLO(3,2-C)-S-TRIAZOLE PHOTOGRAPHIC COUPLERS

摘要

SYNTHESIS AND USE OF NOVEL PYRAZOLO¢3,2-C!-S-TRIAZOLE PHOTOGRAPHIC COUPLERS Pyrazolo¢3,2-c!-8-triazole dye-forming couplers containing in the 6-position a tertiary alkyl group and in the 3-position an aryl group in photographic materials and processes provide dyes of improved light stability. Such couplers can be represented by the formula: wherein R1 is a phenyl group containing alkyl groups in the 2-, 4- and 6-positions of the phenyl group; R2 is tertiary alkyl; R3 is hydrogen or coupling-off group and CHR4 is a coupling-off group. These couplers are particularly useful in combination with alkoxybenzene dye image stabilizers.