Process for the preparation of methyl 2,2-dimethyl, -3-(2'methyl- propenyl) -cyclopropane-1,1-dicarboxylate

摘要

Novel penten-2-yl derivatives of the formula in the trans form ##STR1## 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.