Conversion of pyrethroid isomers to more active species

Details Conversion of pyrethroid isomers to more active species Conversion of pyrethroid isomers to more active species

1990-01-03

1992-07-07

Brust, Joseph Paul

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

Organic compounds

Nitriles

558407, 560124, C07C25334, C07C 69743, C07C 69747

Patent

active

051284979

ABSTRACT:
Crystalline pyrethroid isomers or enantiomer pairs are converted to more pesticidally active isomers by contacting a hydrocarbon slurry of the starting isomers with an epimerization agent selected from the group consisting of 1,1,3,3-tetramethylguanidine and 1,8-diazabicyclo[5.4.0]undec-7-ene, agitating the slurry while maintaining a temperature effective for conversion, and recovering the resulting isomers. The process typically is effective for enriching cypermethrin, and cyfluthrin.

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