Synthesis and use of novel pyrazolo(3,2-c)-s-triazole...

Details Synthesis and use of novel pyrazolo(3,2-c)-s-triazole... Synthesis and use of novel pyrazolo(3,2-c)-s-triazole...

C - Chemistry, Metallurgy

07

D

96/134, 260/299

C07D 487/04 (2006.01) C09B 57/00 (2006.01) G03C 7/305 (2006.01) G03C 7/38 (2006.01)

Patent

CA 1283919

SYNTHESIS AND USE OF NOVEL PYRAZOLO[3,2-C]-S-TRIAZOLE PHOTOGRAPHIC COUPLERS Abstract of the Disclosure 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: Image 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.

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