Process for the preparation of an enantiomeric pair of isomers o

Details Process for the preparation of an enantiomeric pair of isomers o Process for the preparation of an enantiomeric pair of isomers o

1985-08-26

1987-07-21

Torrence, Dolph H.

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

Organic compounds

Nitriles

C07C12175

Patent

active

046819690

ABSTRACT:
A process is described by which the pair of isomers represented by (R)-.alpha.-cyano-4-fluoro-3-phenoxybenzyl (1R,cis)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylate and its enantiomer is converted by base catalyzed epimerization in solution into the insecticidally more useful isomer pair represented by (S)-.alpha.-cyano-4-fluoro-3-phenoxybenzyl (1R,cis)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropane carboxylate and its enantiomer, which may then be caused to crystallize out from the solution.

REFERENCES:
patent: 4287208 (1981-09-01), Fuchs et al.
patent: 4308279 (1981-12-01), Smeltz
patent: 4544508 (1985-10-01), Fuchs et al.

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