NOVEL INTERMEDIATE CARBALDEHYDE DERIVATIVE OF CYCLOPROPANE IN THE PREPARATION OF CYCLOPROPANECARBOXYLATE ESTERS AND PROCESS FOR ITS PREPARATION

摘要

The invention relates to a compound which is suitable as an intermediate in the production of pyrethroid insecticides and which has the formula IMAGE The compound is preferably in the same stereoisomeric form as the cyclopropane ring of (+)-3-carene. The compound can be prepared by a process comprising the oxidation of 2-(2-hydroxymethyl-3,3-dimethylcyclopropyl) ethanal dimethyl acetal, for example using a bromine trioxide/pyridine complex or a pyridinium chlorochromate. The starting substance is preferably derived from (+)-3-carene.