| abstract |
NEW MATERIAL:The compound of formula I (R 1 WR 4 are alkyl, aryl or cycloalkyl wherein the aryl may be substituted with halogen or lower alkyl or the alkyl may together form a ring; R 5 WR 10 are H, alkylhalogen, alkoxy, etc.; the adjacent R's may together form a ring). n EXAMPLE: 3-Diethylamino-6-chloro-7-methyl-9-( 2-methylphenylcarboxamide )phenylxanthene. n USE: Extremely useful as a chromogen of pressure-sensitive recording paper, heat- sensitive recording paper, etc. It exists as a stable colored substance without causing the cyclization to a fluorane compound, and has extremely excellent stability to water, plasticizer, etc. n PREPARATION: The compound of formula I can be produced by reducing the fluoran compound of formula IV, drying the obtained leuco compound of formula V, treating with a chlorination reagent in an inert solvent, and reacting with an amine. n COPYRIGHT: (C)1985,JPO&Japio |