Chemical process for preparing alkyl esters or the amide of 3-(.

Details Chemical process for preparing alkyl esters or the amide of 3-(. Chemical process for preparing alkyl esters or the amide of 3-(.

1977-11-17

1980-10-14

Trousof, Natalie

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

Organic compounds

Carboxylic acid esters

260464, 260453RW, 260557R, 562506, C07C10208, C07C 6722

Patent

active

042282993

ABSTRACT:
Process for the preparation of 1-lower alkoxycarbonyl-3-(.beta.,.beta.-dichlorovinyl)-2,2-dimethylcyclopropanes from the corresponding 1-cyano-1-carboxylic acid ester by hydrolysis, decarboxylation of the free carboxylic acid, reaction of the cyclopropane nitrile with a lower aliphatic alcohol and anhydrous hydrogen chloride, followed by alcoholysis or hydrolysis of the reaction product so obtained to give the desired ester or carboxylic acid. Includes a method for the separation of essentially pure cis- and trans-isomers from the mixed nitriles. The products are useful intermediates for the preparation of pyrethroid insecticides.

REFERENCES:
patent: 3658879 (1972-04-01), Julia
patent: 4000180 (1976-12-01), Punja
Zil'berman, Russian Chemical Reviews, vol. 31, pp. 615-633 (1962).

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