Preparation of mixtures of cypermethrin or cyfluthrin...

Details Preparation of mixtures of cypermethrin or cyfluthrin... Preparation of mixtures of cypermethrin or cyfluthrin...

C - Chemistry, Metallurgy

07

C

C07C 255/39 (2006.01) C07C 253/30 (2006.01)

Patent

CA 2068532

This application discloses a process for the preparation of an (R,S)-(cyano)(3-phenoxyphenyl)methyl or (R,S,)-(cyano)(4-fluoro-3-phenoxyphenyl)methyl cis/trans-3-(2,2-dichloroethenyl)-2,2-dimethylcyclo- propanecarboxylate enriched in the more insecticidal c2 and t2 isomers by the addition of (R,5)-.alpha.-hydroxy-3- phenoxyphenylacetonitrile or (R,S,)-.alpha.-hydroxy-4-fluoro- 3-phenoxyphenylacetonitrile to the cis/trans acid chloride in refluxing heptanes in an inert atmosphere. The reaction mixture is then washed with aqueous base and the ester recovered.

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