Lactones

Details Lactones Lactones

C - Chemistry, Metallurgy

07

C

260/485.3, 260/5

C07C 57/76 (2006.01) C07C 69/65 (2006.01) C07C 69/743 (2006.01) C07D 307/32 (2006.01)

Patent

CA 1218074

ABSTRACT "Lactones" Esters of 3-.beta.,.beta.-dihalovinyl-2,2-dimethylcyclopropane- 1-carboxylic acids are prepared from 4-.beta.,.beta.-dihalovinyl-3, 3-dimethyl butyrolactone by reaction with an inorganic acid halide to open the lactone ring with formation of the corresponding 4-haloacid halide, which with alcohols affords the corresponding 4-haloacid ester which is cyclised by bases to give the above product. The products are intermediate for insecticidal esters and the process offers fewer stages and higher yields than the processes hitherto described or used.

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