| 摘要 |
Cyan azo dye-providing compounds have the formula: <IMAGE> wherein: R1 is selected from the group consisting of aryl, alkyl or NR11R12 wherein R11 is alkyl or aryl and R12 is alkyl, or R11 and R12, taken together with the nitrogen atom to which they are attached, is a heterocyclic group; X is -CO- or -SO2-; R3 is -COOH or -CAR and is attached in the meta or para position to X in the benzene ring; R is alkyl; <IMAGE> can be taken together with R and the nitrogen atom to which it is attached to form a heterocyclic ring unsubstituted or substituted with a carboxy group; and CAR is a carrier moiety which, as a function of oxidation under alkaline conditions, releases a diffusible dye, with the proviso that the compound contains at least one CAR group and, excepting when R and R2 form a heterocyclic group and X is -SO2-, must contain at least one carboxy group. The compounds are particularly useful in photographic elements and more particularly useful in image transfer film units.
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