High purity full me non and its production mannered

摘要

PROBLEM TO BE SOLVED: To simply and efficiently manufacture high-purity fluorenone by separating and removing impurities from fluorenone at a high degree.;SOLUTION: By such a method as to form an insoluble matter under heating in the presence of an acid catalyst, an impurity (the one bearing hydroxy group, e.g., 9-methyl-9-fluorenol) in fluorenone is converted into a derivative having a solubility or boiling point different from that of fluorenone. The derivative is separated and removed from fluorenone, giving high-purity fluorenone. When analyzed by gas chromatography at a column temperature of 180°C by using a silica gel as a column filler, the high-purity fluorenone substantially exhibits no peak within a retention time of 16-18 min and exhibits a single peak within a retention time of 18.5-19.5 min. An ethanol solution of the high-purity fluorenone with a concentration of 20 wt.% has a transmittance of 99% or higher at a wavelength of 600 nm.;COPYRIGHT: (C)2004,JPO