PROCESS FOR PRODUCING MIXTURE OF DIHYDROXYDIPHENYLSULFONE ISOMERS

Title:

PROCESS FOR PRODUCING MIXTURE OF DIHYDROXYDIPHENYLSULFONE ISOMERS

Document Type and Number:

WIPO Patent Application WO/2003/029204

Kind Code:

A1

Abstract:

It is intended to provide a process for producing a mixture of dihydroxydiphenylsulfone isomers containing 2,4’−dihydroxydiphenylsulfone characterized in that 4,4’−dihydroxydiphenylsulfone or a mixture of dihydroxydiphenylsulfone isomers containing 85% by weight or more of 4,4’−dihydroxydiphenylsuflone is heated in the presence of phenol and sulfuric acid, or in the presence of phenol and sulfonic acid.

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Inventors:

OI FUMIO (JP)
YANASE NORIO (JP)
YAMAMOTO MASAMICHI (JP)

Application Number:

PCT/JP2002/009920

Publication Date:

April 10, 2003

Filing Date:

September 26, 2002

Export Citation:

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Assignee:

KONISHI CHEM IND (JP)
OI FUMIO (JP)
YANASE NORIO (JP)
YAMAMOTO MASAMICHI (JP)

International Classes:

C07C315/04; C07C317/22; (IPC1-7): C07C315/04; C07C317/22

Foreign References:

EP0220004A1	1987-04-29
EP0461272A1	1991-12-18
EP0627415A1	1994-12-07
EP0755920A1	1997-01-29
US4996367A	1991-02-26
JPH1025277A	1998-01-27
JPH10139756A	1998-05-26
JPS50116446A	1975-09-11

Other References:

YOSHIHIRO YOSHII ET AL.: "Phenol no sulfon-ka oyobi hydroxyphenyl sulfonyl-ka no haikosei", JOURNAL OF THE CHEMICAL SOCIETY OF JAPAN, no. 1, 1985, pages 70 - 74, XP002963481
See also references of EP 1431282A4

Attorney, Agent or Firm:

Saegusa, Eiji (1-7-1 Doshomachi, Chuo-k, Osaka-shi Osaka, JP)

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