INTERMEDIATES IN THE PREPARATION OF CYCLOPROPANECARBOXYLATE ESTERS AND PROCESS FOR THEIR MANUFACTURE

摘要

Novel intermediates in the manufacture of pyrethroid insecticides have the following general formula (III) wherein R1 is an alkyl group of 1 to 6 carbon atoms. The cyclopropane ring preferably has the same stereochemical form as the cyclopropane ring in (+)-3-carene. The novel intermediates can be prepared by a process which comprises subjecting 4-hydroxy-2-carene to ozonolysis in the presence of an alkanol and reducing the ozonide product to the desired compound III. The starting material is preferably derived from (+)-3-carene.