Patent ID: 6071683
Filing Date: 2000-06-06
Classification: C07C,C07D,G03C

Abstract:
A photographic element comprising a silver halide cmulsion having associated therewith a dye-forming coupler of formula (Ia) ##STR9## wherein R.sup.1 is selected from an alkyl group, an aryl group, a 5-10 membered heterocyclic group containing one or more O, N or S atoms, each of which groups is unsubstituted or substituted, or a substituted amino group;R.sup.2 is an unsubstituted alkyl group having a secondary or tertiary carbon atom attached to the oxygen atom;X is hydrogen or a coupling-off group;R.sup.3 is selected from the group consisting of halogen, an unsubstituted alkyl group, an unsubstituted or substituted group selected from aryl, heterocyclic, carboxylic acid, alkoxy-, aryloxy-, and heterocyclyloxy-carbonyl, aryl- and hetcrocyclyl-amido, alkyl-, aryl-, and heterocyclyl-sulfonamido, primary, secondary, and tertiary amino, alkoxy, aryloxy, acyloxy, arylcarbamoyl, alkyl-, aryl-, and heterocyclyl-sulfamoyl, alkyl- and aryl-sulfonyl, and alkyl-, aryl-, and heterocyclyl-sulfonyloxy;n is 0 to 4;provided R.sup.2 and R.sup.3, each as defined above, may together with the O atom form a 5-10 membered heterocyclic group which may contain one or more further heteroatoms selected from O, N and S, said group being unsubstituted or substituted; and,wherein at least one of R.sup.1, R.sup.2 and R.sup.3 separately or in combination constitutes a ballast group; andprovided that (a) when R.sup.2 is i-propyl, R.sup.3 may not in the 5-position be an untsubstituted alkylsulfonamido group or the group --SO.sub.2 NHC.sub.12 H.sub.25 (n);(b) when R.sup.2 is cyclohexyl, R.sup.3 may not in the 5-position be an unsubstituted alkylsulfonamido group;(c) when R.sup.2 is t-butyl, R.sup.3 may not in the 5-position be the group --NHSO.sub.2 C.sub.6 H.sub.4 OC.sub.12 H.sub.25 (p).