Title:
NOVEL SULFONE DERIVATIVES AND PROCESS FOR PRODUCING THESE
Document Type and Number:
WIPO Patent Application WO/2002/062752
Kind Code:
A1
Abstract:
A process for producing a cyclic sulfone compound represented by the formula (2) (2) or the formula (4) (4) (wherein the three broken lines indicate that one of the three bonds is a double bond; Ar represents optionally substituted aryl; and the wavy line indicates that the compound is either of the geometric E and Z isomers or a mixture of these), characterized by cyclizing a compound represented by the formula (1) (1) or the formula (3) (3) (wherein Ar and the wavy line have the same meanings as defined above) in the presence of an acid catalyst. This process is an excellent process for retinol production from the standpoints of the cost of starting materials, intermediate purification, number of steps, etc.
Inventors:
KIMURA KAZUTAKA (JP)
TAKAHASHI TOSHIYA (JP)
SEKO SHINZO (JP)
TAKAHASHI TOSHIYA (JP)
SEKO SHINZO (JP)
Application Number:
PCT/JP2002/000869
Publication Date:
August 15, 2002
Filing Date:
February 04, 2002
Export Citation:
Assignee:
SUMITOMO CHEMICAL CO (JP)
KIMURA KAZUTAKA (JP)
TAKAHASHI TOSHIYA (JP)
SEKO SHINZO (JP)
KIMURA KAZUTAKA (JP)
TAKAHASHI TOSHIYA (JP)
SEKO SHINZO (JP)
International Classes:
C07C315/04; C07C317/14; C07C403/22; (IPC1-7): C07C403/22; C07C317/14; C07C315/00
Domestic Patent References:
| WO2000024713A1 | 2000-05-04 |
Foreign References:
| DE19926090A1 | 1999-12-16 | |||
| EP0900785A2 | 1999-03-10 | |||
| EP0523534A2 | 1993-01-20 | |||
| GB1396626A | 1975-06-04 |
Attorney, Agent or Firm:
Aoyama, Tamotsu (Shiromi 1-chome Chuo-ku Osaka-shi, Osaka, JP)
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