New derivative carbaldehyde from cyclopropane intermediate in the preparation of esters cyclopropanecarboxylates and method for its preparation

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.