Preparation of mixtures of cypermethrin or cyfluthrin isomers en

Details Preparation of mixtures of cypermethrin or cyfluthrin isomers en Preparation of mixtures of cypermethrin or cyfluthrin isomers en

1989-11-17

1991-07-02

Brust, Joseph Paul

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

Organic compounds

Nitriles

C07C25330

Patent

active

050287311

ABSTRACT:
A mixture of isomers of cypermethrin or cyfluthrin enriched in the more insecticidally active c.sub.2 or t.sub.2 isomer, or both, is prepared by adding .alpha.-hydroxy-3-phenoxyphenylacetonitrile or its 4-fluoro analog to a refluxing solution of 3-(2,2-dichloroethenyl)-2-2-dimethylcyclopropanecarbonyl chloride in a hydrocarbon solvent boiling in the range of about 75.degree. to 115.degree. C. in an inert atmosphers, without an acid acceptor being present in the reaction mixture. The product is recovered by washing the reaction mixture with aqueous base.

REFERENCES:
patent: 2769835 (1956-11-01), Kosmin et al.
patent: 3078306 (1963-02-01), von Schickh et al.
patent: 3082236 (1963-03-01), Mageli et al.
patent: 4024163 (1977-05-01), Elliott et al.
patent: 4536345 (1985-08-01), Martel et al.
Weygand/Hilgetag, "Preparation Organic Chemistry", (1972), p. 378, John Wiley & Sons, N.Y., Sydney, London, Toronto.

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