Process for the preparation of pyrethrins and analogues...

Details Process for the preparation of pyrethrins and analogues... Process for the preparation of pyrethrins and analogues...

C - Chemistry, Metallurgy

07

C

260/479.8

C07C 69/743 (2006.01) A01N 53/00 (2006.01)

Patent

CA 1133929

Abstract of the Disclosure The invention relates to a new process for the preparation of optically active or racemic pyrethrin compounds of general formula I Image (I ) (wherein R11 is a straight or branched chain lower alkyl group or 1-alkenyl group or hydrogen; R and R12 may be the same or different and stand for hydrogen, halogen or lower alkyl or one of the symbols R and R12 may also stand for lower alkoxy- carbonyl; the ? valency bond represents .alpha.- and/or .beta.-configuration; the - valency bond represents .beta. -configuration). The compounds are prepared by subjecting an optically active or racemic chrysanthemic ester derivative of formula II Image (wherein R11, R and R12, ? and - have the meanings given above) to oxidation by treatment with an oxidizing agent in an aprotic or inert organic solvent The pyrethrin compounds of formula I are valuable insecticides.

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