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

1981-09-08

Torrence, Dolph H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

260124, C07C 6974, C07C12175

Patent

active

042883873

ABSTRACT:
3-Halogenoethyl- or propyl-2,2-dimethylcyclopropane carboxylic acid esters, which are intermediates in the preparation of synthetic pyrethroids, are prepared by the reaction of certain halogenopentenes or hexenes with a diazoacetic ester in the presence of a catalyst which is metallic copper or a copper (II) salt, a rhodium (II) salt of a carboxylic acid or a transition metal complex of certain chiral Schiff bases. By the use of the latter class of catalysts the yield of preferred cis IR isomer may be increased relative to the other possible isomers.

REFERENCES:
patent: 3868401 (1975-02-01), Aratani et al.
patent: 4029690 (1977-01-01), Aratani et al.
patent: 4166064 (1979-08-01), Kondo et al.
patent: 4183948 (1980-01-01), Huff

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