Process for preparing racemized cyclopropanecarboxylic acids or

Details Process for preparing racemized cyclopropanecarboxylic acids or Process for preparing racemized cyclopropanecarboxylic acids or

1982-03-18

1984-11-27

Trousof, Natalie

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

Organic compounds

Carboxylic acids and salts thereof

260544L, 260546, 562506, C07B 2000, C07C 5156

Patent

active

044852576

ABSTRACT:
The present invention is to provide the process for preparing racemized cyclopropanecarboxylic acids or their acid anhydrides from the corresponding optically active, particularly levo-rotatory, cyclopropanecarboxylic acid anhydrides. The racemization is effected by the treatment of the optically active acid anhydride with a Lewis acid. Thus, the present racemization process enables more efficient commercial production of dextro-rotatory cyclopropanecarboxylic acids, which are the more effective acid component of pyrethroidal insecticides, when combined with an optical resolution process.

REFERENCES:
patent: 3794680 (1974-02-01), Matsui et al.
patent: 3989750 (1976-11-01), Nagase et al.
patent: 4182906 (1980-01-01), Suzukamo et al.

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