A PROCESS FOR THE PREPARATION OF 1-(2,2-DIMETHOXY-ETHYL)-3,3,-DIMETHYLCYCLOPROPANE-2-CARBALDEHYDE

摘要

Novel intermediate in the manufacture of pyrethroid insecticides has the following formula The compound preferably has the same stereoisomeric form as the cyclopropane ring in (+)-3-carene. The novel intermediate can be prepared by a process which comprises oxidising 2-(2-hydroxymethyl-3,3-dimethylcyclopropyl)ethanal dimethyl acetal, for example by means of a chromium trioxide-pyridine complex of a pyridinium chlorochromate. The starting material is preferably derived from (+)-3-carene.