Process for production of .beta.-dihalogen-...

Details Process for production of .beta.-dihalogen-... Process for production of .beta.-dihalogen-...

C - Chemistry, Metallurgy

07

C

260/518, 260/585

C07C 49/163 (2006.01) A01N 37/06 (2006.01) C07C 23/04 (2006.01) C07C 49/16 (2006.01) C07C 49/327 (2006.01) C07C 51/377 (2006.01) C07C 61/15 (2006.01) C07C 61/35 (2006.01) C07C 61/40 (2006.01) C07C 62/18 (2006.01) C07C 67/00 (2006.01) C07C 69/74 (2006.01) C07C 69/743 (2006.01) C07C 69/747 (2006.01) C07C 69/757 (2006.01)

Patent

CA 1146580

ADSTRACT OF THE DISCLOSURE A novel process for producing a .beta.-dihalogeno- ethenyleyclopropane derivative of the formula, Image wherein R? is a hydrogen atom or an alkyl group, R3 is a hydrogen atom, lower alkyl, acyl, carboxyl or alkoxy- carbonyl group and R is a hydrogen atom or a lower alkyl group and each of Y1 and Y2 is a fluorine, chlorine or bromine atom respectively, which is an acidic moiety of the useful synthetic insecticides of the pyrethrin type, which process comprises a combination of a series of sequential stops start- ing from alkyl 3-butenyl ketone derivative of the formula (I), which may be shown according to the following reaction scheme: Image Image According to this process, objective compound of the formula (VI) having any cis/trans ratio can be produced by selecting the reaction condition of the Stages II-1, II-2 and IV-2.

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