Patent ID: 8841491

Claim:
A method for producing a fluorene derivative of formula (II) (wherein R 2 is an alkylene group; R 1 is selected from an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group, an alkoxy group, and a halogen atom; n is 0 or an integer of 1 or greater; and m is 0 or an integer of 1 to 4, with the proviso that when m is 0, n is an integer of 1 or greater) by reacting fluorenone with a compound of formula (I) (wherein R 2 is an alkylene group; R 1 is selected from an alkyl group, a cycloalkyl group, an aryl group, an aralkyl group, an alkoxy group, and a halogen atom; n is 0 or an integer 1 or greater; and m is 0 or an integer of 1 to 4, with the proviso that when m is 0, n is an integer of 1 or greater) in the presence of an acid catalyst, said method, comprising the steps of: reacting the fluorenone with the compound of formula (I) in the presence of the acid catalyst to obtain a reaction mixture liquid that contains the fluorene derivative of formula (II); and after addition of an alkali to the reaction mixture liquid that contains the fluorene derivative after completion of reaction, concentrating the reaction mixture liquid without removing the alkali thus added and a reaction product of the alkali, thereby separating an unreacted compound of formula (I).