| 摘要 |
PURPOSE: A process for preparing a diphenylsulfone compound is provided to easily separate unreacted biphenylsulfone compound from an object compound without employing expensive organic solvents and performing difficult pH control step. CONSTITUTION: The diphenylsulfone compound of the formula 1 is prepared by the process comprising reacting 4,4-dihydroxydiphenylsulfone compound of the formula 2 and a halide of the formula 4: R-X, using water as a solvent in the presence of a base, wherein the process comprises depositing 4-hydroxy-4'-isopropoxydiphenylsulfonate compound of the formula 3 in a solid form by using 0.25-3.0 parts by weight of water, based on 1 parts by weight of 4,4'-dihydroxydiphenylsulfone compound and by using the base in a mole ratio of 2.0-3.0, based on 1 mole of 4,4'-dihydroxydiphenylsulfone compound, followed by filtrating to separate out unreacted 4,4-dihydroxydiphenylsulfone compound. In the formulas 1-4, R represents isopropyl group, M represents an alkali metal and an alkali earth metal, and X represents a halogen atom.
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