| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for industrially and advantageously producing a fluoran compound. SOLUTION: A fluoran compound expressed by general formula (4) (wherein R1 and R2 express each an alkyl, a cycloalkyl, an alkoxyalkyl, a tetrahydrofurfuryl or a phenyl which may have substituents and can form a ring by bonding to each other; X1 expresses H or an alkyl; X2 expresses H, an alkyl, a halogen atom or an amino and X3 express H; X3 together with adjacent X1 or X2 can form a benzene ring by bonding to each other) is produced by reacting a benzophenonecarboxylic acid derivative expressed by general formula (1) (M expresses a sodium atom or a potassium atom) with a phenol derivative expressed by general formula (2) (R3 expresses H or an alkyl) in a condensation agent. |
