Process for the production of 2-(2',2',2'-...

Details Process for the production of 2-(2',2',2'-... Process for the production of 2-(2',2',2'-...

C - Chemistry, Metallurgy

07

C

260/583.7, 260/5

C07C 49/457 (2006.01)

Patent

CA 1113501

Abstract of the Disclosure The invention relates to a process for the prep- aration of 2-(2',2',2'-tribromoethyl)-4-chlorocyclo- butan-1-ones of the formula I Image (I) in which one of the radicals R1 and R2 is methyl and the other is hydrogen or methyl, or R1 and R2 together are an alkylene group having 2 to 4 carbon atoms. The process comprises reacting 2-chloro-4,4,4-tribromo- butyric acid chloride, in the presence of an organic base, with an ethylene, which is disubstituted in the 1-position by the radicals R1 and R2 according to the above definition, to give a 2-(2',2',2'-tribromoethyl)- 2-chlorocyclobutan-1-one, and then rearranging this, in the presence of a catalyst, into a 2-(2',2',2'-tribromo- ethyl)-4-chlorocyclobutan-1-one of the formula I. The 2-(2',2',2'-tribromoethyl)-4-chlorocyclobutan-1-ones of the formual I which can be prepared according to the invention are valuable intermediates for the preparation of 2-(2',2'-dibromovinyl)-cyclopropane-1-carboxylic acids and esters thereof having an insecticidal action.

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