| 摘要 |
NEW MATERIAL:A benzofluoran compound of formula I (wherein R<1> is H or a 1-8C alkyl; R<2> is H, a 1-8C alkyl, a 5-7C cycloalkyl, benzyl or phenyl; X is a 1-8C alkyl, a 5-7C cycloalkyl, benzyl or phenyl; m represents the number of the substituents X and is 0, 1, 2, or 3). USE:A color former. A benzofluoran compound of formula I is almost colorless itself, is stable in the air, and causes neither sublimation nor spontaneous coloring. It has good solubility in an organic solvent and forms a color, such as a dense purple, blue or green color, instantaneously with a developer. It is used for a pressure-sensitive copying paper, heat-sensitive recording paper, a laser recording paper, a photographic recording paper, etc. PREPARATION:A 6-amino-1-naphthol derivative is reacted with phthalic anhydride in the presence of a Friedel-Crafts catalyst to synthesize a 1-hydroxy-6- amino-2-(o-carboxybenzoyl)naphthalene derivative of formula II, which is then reacted with a phenol derivative of formula II (wherein R is H or a lower alkyl) in the presence of a dehydration and condensation agent to give the objective compound. |
