| 摘要 |
Photographic elements, film units, processes and alkaline processing compositions are described wherein certain subsituted 1-phenyl-3-pyrazolidinones are employed as electron transfer agents in color image transfer materials. The silver halide electron transfer agents or precursors thereof have the following formula: <IMAGE> wherein: R is hydrogen or a hydrolyzable moiety; R1 is hydrogen or a hydroxy group; R2, R3 and R4 each represent hydrogen, hydroxy, an alkyl group of 1 to 3 carbon atoms, an alkoxy group of 1 to 3 carbon atoms, a phenyl group, -NHSO2R5, -O(CH2)nOR6, -(CH2)nOR6, -O(CH2)nC6H5, -(CH2)nR7, or -O(CH2)nR7; R5 is hydrogen or an alkyl group of 1 to 3 carbon atoms; R6 is hydrogen or a methyl group; R7 is NHSO2R5 or SO2NHR5; and n is a positive integer of 1 to 2; with the proviso that at least one of R2, R3 and R4 must be one of the groups other than hydrogen.
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