SUBSTITUTED PENT-2-ENYL DERIVATIVES OF MALONIC ACID; A METHOD FOR THEIR PREPARATION, AND THEIR USE IN THE SYNTHESIS OF A PRECURSOR OF CHRYSANTHEMIC ACID

摘要

Novel penten-2-yl derivatives of the formula in the trans form I wherein R is selected from the group consisting of hydrogen and acetyl and to a novel process for the preparation of methyl 2,2-dimethyl-3-(2'-methyl-propenyl)-cyclopropane-1,1-dicarboxylate which is an intermediate for chrysanthemic acid.