| 摘要 |
The invention provides a photographic element comprising a support bearing at least one silver halide emulsion layer having associated therewith a 5-pyrazolone photographic coupler represented by the formula (I): <IMAGE> wherein a) substituents G1, G2 and G3 are individually selected from the group consisting of hydrogen, halogen, alkyl, alkoxy, aryloxy, acylamino, alkylthio, arylthio, sulfonamido, sulfamoyl, sulfamido, carbamoyl, diacylamino, alkoxycarbonyl, aryloxycarbonyl, alkoxysulfonyl, aryloxysulfonyl, alkylsulfonyl, alkylsulfoxyl, arylsulfoxyl, arylsulfonyl, alkoxycarbonylamino, aryloxycarbonylamino, alkylureido, arylureido, acyloxy, nitro, cyano, and carboxy groups; b) a and b are individually integers from 0 to 5, provided that the sum of the sigma values for G1 and G2 is at least 1.3; and c is an integer from 0 to 4; c) Z is a group of the formula (II): <IMAGE> wherein R1 is selected from the group consisting of hydrogen, alkyl, alkenyl, aryl, acyl, and heterocyclic groups; R2 is hydrogen; R3 is selected from the group consisting of hydrogen and alkyl groups having from 1 to 16 carbon atom; and each R4 is an identically substituted methyl or silyl group.
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