Process for synthesizing 9,9-bis-(4-hydroxyphenyl)fluorene

Details Process for synthesizing 9,9-bis-(4-hydroxyphenyl)fluorene Process for synthesizing 9,9-bis-(4-hydroxyphenyl)fluorene

C - Chemistry, Metallurgy

07

C

260/615.7

C07C 37/20 (2006.01) C07C 39/17 (2006.01)

Patent

CA 2030539

Abstract The invention concerns a process for synthesizing 9,9- bis(hydroxyphenyl)fluorene by reacting flourene with excess phenol using a liquid catalyst prepared by dissolving aluminum trichloride in an anhydrous organic solvent such as toluene evincing the property of an electron donor while hydrochloric-acid gas is being supplied. For the purpose of the synthesis, the fluorenone is dissolved for instance at 60° C in the liquid phenol and then the liquid catalyst is dripped into the agitated reaction mixture at such a rate that the temperature of the reaction mixture is kept below 60° C Following catalyst addition and subsequent after-reaction interval of several hours, the raw product is mixed with hot water and the excess phenol is removed by steam distillation. After single-washing with water, the raw product is dissolved in hot acetone, allowed to crystallize, is filtered out and dried in vacuum. Lastly the raw product is recrystallized from 1,2-dichloroethane to form the pure product.

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