Isolation of cis-isomers from isomeric mixtures of cis/transcycl

Details Isolation of cis-isomers from isomeric mixtures of cis/transcycl Isolation of cis-isomers from isomeric mixtures of cis/transcycl

1989-08-25

1991-09-10

Evans, J. E.

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

Organic compounds

Carboxylic acids and salts thereof

C07C 51347, C07C 5142

Patent

active

050475819

ABSTRACT:
The treatment of isomeric mixtures of cis/trans -3-(2,2-dihalo-3,3,3-trifluoropropyl)-2,2-dimethylcyclopropanecarboxylic acid esters with excess base at elevated temperatures hydrolyzes the ester, dehydrohalogenates the side chain, and thereafter selectively converts the resulting unsaturated side chain of the corresponding trans-cyclopropanecarboxylic acid to an acetyl byproduct, from which may be readily separated and recovered an enriched concentration of the desired cis-2-halo-1-propenylcyclopropanecarboxylic acid, together with minor amounts of the corresponding transacid.

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