PURPOSE: To purify the titled substance useful as a raw material for heat- resistant polyesters, etc., by removing unreacted phenol from a crude product obtained from fluorenone and phenol, dissolving and depositing the titled substance.
CONSTITUTION: Fluorenone is reacted with phenol in the presence of a catalyst to give a crude product containing the titled aimed substance. The unreacted phenol is first removed by a means, e.g. vacuum evaporation, etc., and the residual reaction products are dissolved in diethyl ether, acetone, ethanol, propanol, dioxane or acetic acid alone or a mixture thereof as a solvent. Thereby the aimed substance is once dissolved to form as adduct with the solvent, which is then crystallized and deposited. The resultant adduct is then separated and heated at 30W80°C under reduced pressure to remove the solvent. The residue is further recrystallized with toluene, etc. to provide the aimed substance of high purity.
USAMI TAKASHI
INOUE HIROHARU
NIPPON STEEL CHEMICAL CO
| US4049721A | 1977-09-20 |
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