1, 1, 1, 5-Tetrachloropentene-3 is converted to 1, 1, 5-trichloropentene-3 when ammonium nitrate is used as a catholyte (Table I). The trichloromethyl group is reduced to dichloromethyl more readily than the allylic chlorine under these conditions. Further reduction of 1, 1, 5-trichloropentene-3 to 1, 5-dichloropentene-3 was unsuccessful, since the allylic chlorine was reduced simultaneously.
