Metal Chlorides-Catalyzed Chlorination of α - and γ -3, 4, 5, 6-Tetrachlorocyclohexene --Yields of 1, 2, 3, 4, 5, 6-Hexachlorocyclohexane lsomers

Abstract

Metal chlorides-catalyzed chlorination of a and 7-3, 4, 5, 6-tetrachiorocyclohexene (BTC) was studied in chlorinated aliphatic hydrocarbons. Yields of BHC isomers are shown in Table 1and 2. ec-BTC formed preferentially ev-1, 2, 3, 4, 5, 6-hexachlorocyclohexane (BHC) especially when SbCls was used as the catalyst. r BTC formed more ev-BHC than in the photochlorination. This trend would be attributed to increase in stearic hindrance caused by neighboring chlorine atoms in r-BTC.