Photographic element containing a magenta coupler having improved manufacturability and dye light stability

摘要

The invention provides a photographic element comprising a silver halide emulsion layer having associated therewith a dye-forming coupler represented by Formula I: <CHEM> wherein X is hydrogen or a coupling-off group; and R' is a tertiary alkyl group and R'' represents the group <CHEM> in which R<1>, R<2>, and R<3> are independently selected alkyl groups, provided that any two of R<1>, R<2,> and R<3> may join to form a ring; R<4> is hydrogen or a substituent, provided that R<3> and R<4> may join to form a ring when R<4> is a substituent; and W is a substituent having the formula: <CHEM> wherein R<a> and R<b> are independently selected from the group consisting of hydrogen, and alkyl or aryl groups;