Blocked pyrazolone magenta dye-forming couplers

Details Blocked pyrazolone magenta dye-forming couplers Blocked pyrazolone magenta dye-forming couplers

C - Chemistry, Metallurgy

07

D

96/136, 117/143,

C07D 231/52 (2006.01) G03C 1/10 (2006.01) G03C 7/384 (2006.01)

Patent

CA 1161043

Abstract of the Disclosure: Novel 5-pyrazolone magenta dye-forming couplers are blocked with a coupler moiety which yields an alkali- soluble or colorless react on product. The coupler moiety is joined via its coupling position to the enol oxygen of the 5-pyrazolone and is displaced therefrom during processing as a result of reaction by means of oxidized color developing agent to thereby activate the 5-pyrazolone coupler. These couplers have good reactivity and good resistance to aerial contaminants, such as formaldehyde, and can be incorporated in photographic emulsions and elements.

368260

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