Studies on Chrysanthemic Acid

Abstract
(±)-trans-2, 2-Dimethyl-3-(2'-methyl-2'-propenyl) cyclopropan-1-carboxylic acid (VII) was obtained by the treatment of (±)-pyrocin (IV) with thionyl chloride and absolute ethanol saturated with dry hydrogen chloride followed by the cyclization action of sodium tert-amylate in dry benzene and alkaline hydrolysis. This was converted into (±)-trans-chrysanthemic acid (VIII) by the catalytic action of p-toluenesulfonic acid.