| 摘要 |
PROBLEM TO BE SOLVED: To obtain 9,9-bis(4-hydroxyphenyl)fluorene compound showing a melting curve maximum of at least 226.00 deg.C and a melting curve width at 5% equal to or lower than 1.30 deg.C. SOLUTION: This method for the preparation of 9,9-bis(4-hydroxyphenyl) fluorene compound comprises (a) a step for reacting, in an organic solvent, a phenol compound with a 9-fluorenone in the presence of an acidic condensing agent, (b) a step for separating the crude 9,9-bis(4-hydroxyphenyl)fluorene and (c) a step for purifying the crude 9,9-bis(4-hydroxyphenyl)fluorene, wherein the purifying method comprises a first purification step employing acetonitrile solvent and a second purification step employing a solvent selected from the group consisting of a aliphatic alcohols, a mixture of aromatic hydrocarbons with aliphatic alcohols and a mixture of aromatic hydrocarbons with nitriles.
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