Cyclopropane derivatives containing the thiocarbonate group

摘要

A process for the preparation of racemic or optically active isomers of alkyl esters of cis chrysanthemic of the formula <IMAGE> I wherein R is alkyl of 1 to 6 carbon atoms comprising reacting a racemic or optically active cis compound of the formula <IMAGE> II wherein R has the above definition with an aryl halothioformate of the formula <IMAGE> III wherein Hal is a halogen and Ar is aryl of 6 to 12 carbon atoms optionally substituted with at least one alkyl of 1 to 3 carbon atoms to obtain a compound of the formula <IMAGE> IV of cis configuration and heating the latter optionally in an organic solvent to obtain the compound of formula I and novel intermediates.