A process for the rearrangement of geminal allylic dihalogen compounds.

摘要

Cis- and trans-1,3-dichloropropenes and their homologs and 1,3- dibromopropenes can be prepared by isomerizing the corresponding 3,3- dihalopropene or homolog thereof in a simple, high yield process by contacting the latter with an effective silica, alumina, or zeolite catalyst. Thus, a mixture of cis- and trans-1,3-dichloropropenes is produced in good yield and with good selectivity when a mixture of 3,3- dichloropropene with other chlorinated hydrocarbons, principally 1,2- dichloropropane, is contacted with an acidic activated alumina catalyst at a temperature of about 100° C.