Process for the preparation of cyclopropane carboxylic acid este

Details Process for the preparation of cyclopropane carboxylic acid este Process for the preparation of cyclopropane carboxylic acid este

1980-06-02

1982-08-17

Shippen, Michael L.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252431N, 536 4, 536 18, 536121, 542414, 542422, 542424, 560124, C07C12000, C07C 67347

Patent

active

043448941

ABSTRACT:
3-(Halogenovinyl- or propenyl-)-2,2-dimethyl cyclopropane-1-carboxylic acid esters, which are precursors of, or may themselves be, pyrethroid insecticides, are prepared by the reaction of certain halogenopentadienes with an alkyl diazoacetate in the presence of a catalyst which is a transition metal complex of certain chiral Schiff bases, which catalysts tend to increase the yield of preferred cis IR isomer relative to the other possible isomers.

REFERENCES:
patent: 3868401 (1975-02-01), Arakani
patent: 4069385 (1978-01-01), Araki
patent: 4197408 (1980-04-01), Avatani

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