| 摘要 |
NEW MATERIAL:To obtain a fluoran compound of the formula I (where R<1> is a C1-C4 alkyl, R<2> is methyl or ethyl, R<3> is H, a C1-C4 alkyl, or benzyl, X<1> and X<2> are each H, Cl, or a C1-C4 alkyl, X<3> is H, Cl, or trifluoromethyl, and n is 1 or 2). EXAMPLE:2-Anilino-3-methyl-6-(N-methyl-N-methoxypropyl) aminofluoran of the formula II. USE:A chromogenic substance for pressure-sensitive or heat-sensitive duplicate papers capable of coloring in black. PROCESS:2-(4'-Amino-2'-hydroxy-benzoyl) benzoate derivative of the formula IV, obtained from condensation of an m-aminophenol derivative of the formula IIIwith phthalic anhydride, is reacted with a diphenylamine derivative of the formula V (where R is H or a C1-C4 lower alkyl) in the presence of a dehydrocondensation agent (e.g., sulfuric acid). |
