| 摘要 |
Etherified fluorescein compounds of the general formula <IMAGE> (1) in which X1 is alkyl having 4 to 12 carbon atoms or cycloalkyl and X2 is alkyl which is unsubstituted or substituted by halogen, hydroxyl, cyano or lower alkoxy, or cycloalkyl, the rings A and B, independently of one another, are unsubstituted or substituted by halogen, lower alkyl or lower alkoxy, and the ring D is unsubstituted or substituted by halogen, nitro, lower alkyl, lower alkoxy, lower alkylthio, lower alkoxycarbonyl, amino, mono-lower alkylamino or di-lower alkylamino, with the exception that X1 and X2 are not at the same time n-butyl. These novel lactone compounds are particularly suitable for use a color formers in pressure-sensitive or heat-sensitive recording materials and they produce intense yellow, orange or rose-pink colorations. |
