Draft:1,2-Dichlorobut-3-ene

1,2-Dichlorobut-3-ene is an organochlorine compounds that has the chemical formula C4H6Cl2 or CH2Cl-CHCl-CH=CH2. It is produced on large scale as a precursor of chloroprene.

Production and chloroprene preparation

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Chlorine is added to butadiene give a mixture of 1,4- and 1,2-dichlorobut-3-ene. Isomerization then gives pure 1,2-dichlorobutene. Dehydrochlorination gives chloroprene.