2,6-DIETHYL-3,5-DIMETHYL-2,3-DIHYDRO-4H-PYRAN, PROCESS FOR ITS PREPARATION AND ITS USE IN THE EARLY IDENTIFICATION AND LOCATION OF AND IN COMBATING LASIODERMA SERRICORNE F

摘要

A 2,3-dihydropyran of the general formula: IMAGE wherein R1, R2, R3 and R4 are hydrogen or alkyl groups having from 1 to 4 carbon atoms; and where at least two of the groups R1, R2, R3 and R4 are said alkyl groups; including all optical isomers thereof is useful in combatting insects, particularly the tobacco beetle Lasioderma seriicorne F.