Cyclopropane carboxylic acid derivatives

Details Cyclopropane carboxylic acid derivatives Cyclopropane carboxylic acid derivatives

1979-10-18

1987-07-28

Lone, Werren B.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

562401, 562506, C07C 6104

Patent

active

046830898

ABSTRACT:
A process for separating the individual optically active isomers of cis- or trans-forms of cyclopropane carboxylic acids of formula: ##STR1## wherein R.sup.1 is halo, alkyl, alkenyl, haloalkyl, haloalkenyl or haloalkynyl, and R.sup.2 is hydrogen or cyano, from a mixture of cis-isomers or trans-isomers which comprises treating an aqueous solution of a soluble salt of the racemate or diastereoisomeric mixture of the cis- or trans-isomers with just sufficient of a single isomer of an optically active amine to cause precipitation of one isomer or diastereoisomer of the cyclopropane carboxylic acid as the ammonium salt while substantially all of the other isomer remains in solution as the soluble salt.

REFERENCES:
patent: 3786070 (1974-01-01), Martel et al.
patent: 3842125 (1974-10-01), Horiuchi et al.
patent: 3879451 (1975-04-01), Yoshioka et al.
patent: 3892814 (1975-07-01), Raphael et al.
patent: 3979519 (1976-09-01), Punja
patent: 4118417 (1978-10-01), Epstein
patent: 4229593 (1980-10-01), Kondo et al.

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