Novel intermediate in the preparation of cyclopropylcarboxylate esters and process for its manufacture.

摘要

3-Acetoxymethyl-2,2-dimethylcyclopropanecarbaldehyde dimethyl acetal, especially in the same stereoisomeric form as that of the cyclopropane ring in (+)-3-carene, is a novel intermediate useful in the manufacture of pyrethroid insecticides. It may be manufactured by a process characterised in that 2-(3-acetoxy-methyl-2,2- dimethylcyclopropyl)vinyl acetate is subjected to ozonolysis and the ozonolysis product so formed is subjected to reduction in the presence of methanol and an acetalizing catalyst.