Photographic products and processes and novel compounds

Details Photographic products and processes and novel compounds Photographic products and processes and novel compounds

C - Chemistry, Metallurgy

07

D

96/36, 260/304.7

C07D 403/12 (2006.01) C07D 233/54 (2006.01) G03C 1/40 (2006.01) G03C 8/00 (2006.01)

Patent

CA 1227489

ABSTRACT OF THE DISCLOSURE There are described novel photographic products and processes which utilize compounds which releases a photographic reagent in the presence of alkali. The compounds include an imidazole blocking group and cleave in alkali to release the photographic reagent. Also described are novel compounds. A typical compound of this invention has the formula Image wherein R1 is hydrogen, a hydrolyzable group or a group which is cleavable in aqueous alkaline environment; R2 and R3 are the same or different and are hydrogen, a substituent which modifies a property of said compound, or when Image PHOTO is attached to the 2-position, taken together form a five or six member carbocyclic or heterocyclic ring; R4 and R5 are the same or different and are hydrogen or alkyl; and PHOTO is a moiety represented by the formula Image wherein A is sulphur or selenium, and X represents the nonmet- allic atoms necessary to form a nucleus which completes a five or six member heterocyclic moiety; or a photographically acceptable acid addition salt thereof.

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