Process for preparing gamma-cyhalothrin

Details Process for preparing gamma-cyhalothrin Process for preparing gamma-cyhalothrin

C - Chemistry, Metallurgy

07

C

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

Patent

CA 2512429

A process for the preparation of gamma-cyhalothrin comprising steps of a) chlorinating 1R cis-Z 3-(2-chloro-3,3,3-trifluoro-l-propenyl)-2,2-dimethyl cyclopropanecarboxylic acid to give 1R cis-Z 3-(2-chloro-3,3,3-trifluoro-l- propenyl)-2,2-dimethyl cyclopropanecarboxylic acid chloride and b) esterifying 1R cis-Z 3-(2-chloro-3,3,3-trifluoro-l-propenyl)-2,2-dimethyl cyclopropanecarboxylic acid chloride with the (S)-cyanohydrin of 3-phenoxy benzaldehyde (III).

L~invention se rapporte à un procédé pour la préparation de gamma-cyhalothrine consistant à a) chlorer de l~acide 1R cis-Z 3-(2-chloro-3,3,3-trifluoro-1-propényl)-2,2-diméthyl cyclopropane carboxylique pour donner du chlorure d~acide 1R cis-Z 3-(2-chloro-3,3,3-trifluoro-1-propényl)-2,2-diméthyl cyclopropane carboxylique, et b) à estérifier ledit chlorure d~acide avec la (S)-cyanohydrine de 3-phénoxy benzaldéhyde (III).

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