| abstract |
Yellow DIR couplers corresponding to formula I below are capable of producing remarkably powerful inhibitory effects on remote layers while their action on the layer containing them is comparatively slight: <IMAGE> (I) In the above formula, R1 represents straight-chained or branched alkyl, optionally substituted aryl or -NR5R6, R2, R5 represent H or alkyl with 1 or 2 carbon atoms, R3, R6 represent alkyl with 1 to 18 carbon atoms or optionally substituted aryl, R4 represents alkyl with 5 to 12 carbon atoms, and Fu represents a substituted or unsubstituted furyl group. |