| 摘要 |
PURPOSE:To obtain the novel compound, expressed by a specific structural formula, capable of developing a black color, excellent in shelf stability against such as plasticizer, oil, wet heat and light and useful as coloring recording materials such as heat-sensitive recording paper or pressure-sensitive copying paper. CONSTITUTION:This compound is expressed by formula I (R<1> and R<2> are each a 1-5C alkyl, an alkenyl, a 4-6C cycloalkyl or an aryl-substituted 1-3C alkyl; R<1> and R<2> together with the adjacent N atom form pyrrolidino, piperidino or morpholino; R<3> is H, a 1-5C alkyl, an alkenyl, a 4-6C cycloalkyl, an aryl or an aryl-substituted 1-3C alkyl), e.g. 3-methoxy-6-(4-dimethylaminophenyl) aminofluoran. Furthermore, in production thereof, a benzoylbenzoic acid derivative expressed by formula II is reacted with a 3-aminophenol derivative expressed by formula III in the presence of a dehydration condensing agent to synthesize a phthalide compound expressed by formula IV, which is then intramolecularly cyclized in the presence an alkaline substance in an organic solvent to provide the compound. |
