MELLEMPRODUKT TIL FREMSTILLING AF CYCLOPROPYLCARBOXYLATESTERE OG FREMGANGSMAADE TIL FREMSTILLING HERAF

摘要

3-Formyl-2.2-dimethylcyclopropanecarbaldehyde dimethyl acetal, especially in the same stereoisomeric form as that of the cyclopropane ring in (+)-3-carene, is a novel intermediate useful in the manufacture of pyrethroid insecticides. It may be manufactured by a process characterised in that 3-hydroxymethyl-2.2-dimethylcyclopropanecarbaldehyde dimethyl acetal is subjected to the action of an oxidising agent, e.g. a chromium trioxidepyridine complex.