Method for racemization of chrysanthemic acid or its ester

Details Method for racemization of chrysanthemic acid or its ester Method for racemization of chrysanthemic acid or its ester

1987-02-03

1988-02-02

Lone, Werren B.

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

Organic compounds

Carboxylic acid esters

562401, 562506, C07B 5500

Patent

active

047230355

ABSTRACT:
Racemization of optically active, particularly the (-)-form of chrysanthemic acid or its ester of the formula: ##STR1## wherein R is, for example, hydrogen or an alkyl group, is effected by contacting it with boron tribromide or aluminum tribromide in the presence of an azo compound. This racemization procedure is useful from a commerical point of view.

REFERENCES:
patent: 3666798 (1972-05-01), Matsui et al.
patent: 3786070 (1974-01-01), Martel et al.
patent: 3989750 (1976-11-01), Nagase et al.
patent: 4182906 (1980-01-01), Suzukamo et al.
patent: 4473703 (1984-09-01), Suzukamo et al.
patent: 4485257 (1984-11-01), Suzukamo et al.

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