Chemical process

Details Chemical process Chemical process

2003-04-08

2009-02-17

Seaman, D. Margaret (Department: 1625)

Organic compounds -- part of the class 532-570 series

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

Reexamination Certificate

active

07491834

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.

REFERENCES:
patent: 6008381 (1999-12-01), Williams et al.
patent: 6372921 (2002-04-01), Miyota et al.
patent: 1054009 (2000-11-01), None
patent: 1072580 (2001-01-01), None
patent: 9748692 (1997-12-01), None

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