Method for the racemization of (2)-2-(4-...

Details Method for the racemization of (2)-2-(4-... Method for the racemization of (2)-2-(4-...

C - Chemistry, Metallurgy

07

C

260/516.6

C07C 59/68 (2006.01) A01N 37/38 (2006.01) C07C 51/487 (2006.01)

Patent

CA 1202320

A METHOD FOR THE RACEMIZATION OF (2)-2- (4-DIFLUOROMETHOXYPHENYL)-3-METHYLBUTYRIC ACID ABSTRACT OF THE DISCLOSURE A method for the racemization and hydrolysis of alkyl esters of (-)-2-(4-difluoromethoxyphenyl)-3- methylbutyric acid, followed by the resolution of said resulting racemic acid into its optically active components via salts prepared from the same with optically active amines and recovery of the dextrorotatory (+) isomer therefrom. The present invention also relates to insecticidal pyrethroids prepared from (+)-2-(4-di- fluoromethoxyphenyl)-3-methylbutyric acid.

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