Abstract
(±) -trans-2,2-Dimethyl-3- (2′-methyl-2′-propenyl) cyclopropan-l-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.
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