| 摘要 |
PURPOSE:To obtain a new compound, syhthesized from an indoline derivative and a 2-hydroxybenzoylbenzoic acid derivative, good in shelf life, light and chemical resistance and useful as an electron donative colorless dye, etc., for heat-sensitive paper, pressure-sensitive paper, photosensitive pressure-sensitive paper, etc. CONSTITUTION:An indoline derivative expressed by formula I [R5 to R<8> are H, (substituted)alkyl, aryl, etc.; R10 are lower alkyl; R6 is H, halogen, alkyl, aryl or alkoxy] (e.g. 2-methyl-3,3-dimethyl-5-methoxyindoline) is made to react with a 2-hydroxybenzoylbenzoic acid derivative expressed by formula II [R1 and R2 are H, (substituted)alkyl or aryl; R3 and R4 are H, acyl, alkyl, alkoxy, halogen, nitro or aryl; Ra is H, halogen, alkyl, aryl or alkoxy] (e.g. 2-hydroxy-4- diethylaminobenzoylbenzoic acid) to afford the objective fluoran compound expressed by formula III (X is alkylene required to form a 5-membered ring). |
