| 摘要 |
Pyrroline- or indoline-containing phthalides of formula <IMAGE> (1) wherein R1 and R2 are each independently of the other lower alkyl, C5-C7cycloalkyl or benzyl or, when taken together, are C4-C6alkylene, Y is alkyl or not more than 12 carbon atoms, unsubstituted or substituted by halogen, cyano, hydroxy or lower alkoxy, or is benzyl, X is hydrogen, alkyl of 1 to 12 carbon atoms or an aryl radical, and the ring A is a benzene or naphthalene ring which is unsubstituted or substituted by one or more members selected from the group consisting of halogen, cyano, lower alkyl, lower alkoxy or lower alkoxycarbonyl, and the ring B is an aromatic or heteroaromatic radical which contains 6 ring atoms and which may contain an aromatic fused ring, which ring B as well as the fused ring may be substituted. These phthalides are particularly suitable for use as color formers in pressure- or heat-sensitive recording materials and give lightfast yellow, orange or red images.
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