Hexachloroethane HCA

Alternatively, if a suitable leaving group is present at a vicinal position (e.g., in hexachloroethane, HCA), elimination may result forming the corresponding unsaturated compound (e.g., tetrachloroethene, PER) ... 

The charge balance in solution is maintained by the release of a cation (M ). Mineral systems such as biotite and vermiculite have been observed in laboratory studies to mediate the reduction of hexachloroethane and carbon tetrachloride (Kriegman-King, 1991, 1992). The heterogeneous electron transfer reaction between hexachloroethane (HCA) and the sheet silicates, resulting in the formation of tetrachloroethylene (PCE), is proposed to occur by the following mechanism ... 

---