'Periodica Polytechnica Budapest University of Technology and Economics'
Abstract
Several routes for the industrial synthesis of 1,1-dichloro-4-methyl-1,3-pentadiene as the
key intermediate of permethrin insecticide have been developed. During the chlorination of
1,1,1-trichloro-4-methyl-pentene-3-ol new 1,3-and 1,5-rearrangements involving chlorine were
observed. Radical species in the processes were detected by ESR spectroscopy and mechanisms
of the rearrangements were rationalized