Title:
PROCESS FOR THE PREPARATION OF 3-ISOCHROMANONE
Document Type and Number:
WIPO Patent Application WO2003095442
Kind Code:
A3
Abstract:
3-Isochromanone is prepared by partially chlorinating o-tolylacetic acid with sulphuryl chloride or chlorine gas in an inert organic solvent in the presence of a free radical initiator. The 2-chloromethylphenylacetic acid first obtained is converted to 3-isochromanone by treatment with a base and separated from unreacted o-tolylacetic acid, which is in the form of a salt, by a phase separation technique. The separated o-tolylacetic acid salt is converted to o-tolylacetic acid by controlled acidification and the o-tolylacetic acid is extracted for re-use. The invention reduces the formation of unwanted, over-chlorinated by-products and leads to a more efficient process.
Inventors:
JONES RAYMOND VINCENT HEAVON (GB)
WHITTON ALAN JOHN (GB)
BENNIE COLIN JOHN (GB)
RITCHIE DAVID JOHN (GB)
BUGNON PASCAL (CH)
WHITTON ALAN JOHN (GB)
BENNIE COLIN JOHN (GB)
RITCHIE DAVID JOHN (GB)
BUGNON PASCAL (CH)
Application Number:
PCT/GB2003/001503
Publication Date:
January 08, 2004
Filing Date:
April 08, 2003
Export Citation:
Assignee:
SYNGENTA LTD (GB)
SYNGENTA PARTICIPATIONS AG (CH)
JONES RAYMOND VINCENT HEAVON (GB)
WHITTON ALAN JOHN (GB)
BENNIE COLIN JOHN (GB)
RITCHIE DAVID JOHN (GB)
BUGNON PASCAL (CH)
SYNGENTA PARTICIPATIONS AG (CH)
JONES RAYMOND VINCENT HEAVON (GB)
WHITTON ALAN JOHN (GB)
BENNIE COLIN JOHN (GB)
RITCHIE DAVID JOHN (GB)
BUGNON PASCAL (CH)
International Classes:
C07B61/00; C07D311/76; (IPC1-7): C07D311/76
Domestic Patent References:
| WO1997048692A1 | 1997-12-24 |
Foreign References:
| EP1072580A1 | 2001-01-31 | |||
| EP1054009A2 | 2000-11-22 |
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