Organic compounds -- part of the class 532-570 series – Organic compounds – Sulfur containing
Patent
1992-06-25
1993-08-31
Cintins, Marianne M.
Organic compounds -- part of the class 532-570 series
Organic compounds
Sulfur containing
C07C31506, C07C31500
Patent
active
052411214
ABSTRACT:
A process for preparing 4,4'-dihydroxydiphenylsulfone, the process including heating 4,4'-dihydroxydiphenylsulfone and 2,4'-dihydroxydiphenylsulfone in the presence of an acid catalyst to isomerize the 2,4'-dihydroxydiphenylsulfone into 4,4'-dihydroxydiphenylsulfone, the process being characterized in that a suspension of 4,4'-dihydroxydiphenylsulfone and 2,4'-dihydroxydiphenylsulfone in a liquid dispersing medium is heated for isomerization while the liquid portion is distilled off or a crystal mixture of 4,4'-dihydroxydiphenylsulfone and 2,4'-dihydroxydiphenylsulfone is heated for isomerization to produce 4,4'-dihydroxydiphenylsulfone in the form of crystal powder.
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Derwent Abs. 01008x/01; Mitsubishi Gas Chem. Prod. Feb. 20, 1974, JA-020327; 4,4'-dihydroxydiphenylsulphone . . . .
J. Chem. Soc. 2854-6 (1949), Hinkel et al.
Hamano Kazuo
Nate Nobuyuki
Ogata Eiji
Cintins Marianne M.
Hydorn Michael B.
Konishi Chemical Ind. Co., Ltd.
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