Process for the preparation of 9,9-bis-(4-hydroxyphenyl)fluorene

摘要

A polyalkylene glycol is added to a reaction mixture obtained by a condensation reaction of fluorenone with phenol in the presence of ss-mercaptopropionic acid and HCl gas, excess phenol is then distilled off, and the residue is crystallised out from a solvent which is miscible with the polyalkylene glycol used. After recrystallisation and treatment with water, 9,9-bis-(4-hydroxyphenyl)fluorene is obtained in the form of a white crystalline product in a purity of above 99%.