Process for preparing cyclopropane carboxylic acid ester derivat

Details Process for preparing cyclopropane carboxylic acid ester derivat Process for preparing cyclopropane carboxylic acid ester derivat

1983-10-25

1985-10-01

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12175

Patent

active

045445109

ABSTRACT:
A process for preparing a compound according to formula I containing substantially equimolar amounts of the 1R cis S- and the 1S cis R-isomers (the cis-2 enantiomer pair) and substantially free of the 1R cis R- and the 1S cis S-isomers (the cis-1 enantiomer pair), ##STR1## wherein R.sup.1 and R.sup.2 are each independently selected from chlorine, bromine and methyl, which process comprises contacting the cis-1 enantiomer pair, alone or in the presence of the cis-2 enantiomer pair, with an organic amine base containing from 5 to 7 carbon atoms and being a secondary amine containing two branched alkyl groups or being a tertiary amine, and then separating off a solid compound containing the cis-2 enantiomer pair and substantially free of the cis-1 enantiomer pair, characterized in that the reaction mixture is in the form a solid-liquid slurry.

REFERENCES:
patent: 4308279 (1981-12-01), Smeltz
patent: 4427598 (1984-01-01), Mason et al.
patent: 4436667 (1984-03-01), Bull

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