| 摘要 |
<p>Novel pyrazolone photographic couplers contain in the coupling position a coupling-off group represented by formula (I) wherein: L1 and L2 individually are unsubstituted or substituted methylene or ethylene; m and n individually are 0 or 1; Y is R1 or ZR2; R1 is an unsubstituted or substituted aryl or heterocyclic group, or is a secondary or tertiary carbon group represented by formula (II), wherein R3 and R4 are selected from the group consisting of halogen, R2 and Z1Rb; wherein Z is O, S, or NRa; Z1 is O, S, or NRc; and R2 is an unsubstituted or substituted alkyl, aryl, or heterocyclic group. R5, R6, Ra, Rb and Rc are as defined in the specification. R3 optionally joins together with at least one of R4 and R5 to form one or two alicyclic or heterocyclic rings, which are optionally further substituted; and X represents the atoms selected from a group consisting of carbon, oxygen, nitrogen, and sulfur atoms necessary to complete a 5-, 6-, or 7-member unsaturated ring. This ring optionally contains further substituents than those indicated above, including other rings fused to the ring containing X. These couplers are useful in photographic elements and processes.</p> |
