Process for the preparation of certain enantiomeric pairs of .al

Details Process for the preparation of certain enantiomeric pairs of .al Process for the preparation of certain enantiomeric pairs of .al

1985-01-09

1985-10-01

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

C07C12175

Patent

active

045445087

ABSTRACT:
A process for the preparation of the enantiomeric pairs (1R-3R-.alpha.S+1S-3S-.alpha.R) and (1R-3S-.alpha.S+1S-3R-.alpha.R) from a mixture of all 8 stereoisomers of the compound .alpha.R/S-cyano-3-phenoxy-4-fluorobenzyl 3R/S-(2,2-dichlorovinyl)-2,2-dimethyl-1R/S-cyclopropanecarboxylate, comprising dissolving the mixture in a secondary or tertiary alkylamine having 2-6 C atoms per alkyl radical, subjecting the solution to crystallization whereby the enantiomeric pairs (1R-3R-.alpha.S+1S-3S-.alpha.R) and (1R-3S-.alpha.S+1S-3R-.alpha.R) crystallize out from the solution, and separating the crystallized material. The crystals are enriched in the most active components.

REFERENCES:
patent: 4133826 (1979-01-01), Warnant et al.
patent: 4136195 (1979-01-01), Warnant et al.
patent: 4151195 (1979-04-01), Warnant et al.
patent: 4218469 (1980-08-01), Fuchs et al.
patent: 4308279 (1981-12-01), Smeltz

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