Selective preparation of isomers and enantiomers of cyclopropane

Details Selective preparation of isomers and enantiomers of cyclopropane Selective preparation of isomers and enantiomers of cyclopropane

1984-08-13

1985-05-07

Coughlan, Jr., Paul M.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

C07D26324, C07D26326

Patent

active

045159564

ABSTRACT:
A process has been discovered for selective preparation of isomers and enantiomers of 2,2-dimethyl-3-(2,2-dihalovinyl)cyclopropane carboxylic acids. In this process an adduct of an alkyl 3,3-dimethyl-4-pentenoate and a substituted 2-oxazolidone is reacted with a substituted dihalomethane compound. The resulting compound is cyclized, dehydrohalogenated and hydrolyzed to yield the desired product. These cyclopropane carboxylic acids are useful precursors for pyrethroid insecticides.

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patent: 4301154 (1981-11-01), Larson
patent: 4332815 (1982-06-01), Engel

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