(2) Liquid Conductivity (pS/m) Relaxation Times Constant (s) Conductive (>10,000 pS/m) Liquids Ethyl Alcohol 1.35 x [10.sup.5] 1.6 x [10.sup.-3] (25[degrees]C) Isopropyl Alcohol 3.5 x [10.sup.8] 5 x [10.sup.-7] (25[degrees]C) Water, distilled ~1 x [10.sup.9] 7.1 x [10.sup.-4] Semi-Conductive (100-[10.sup.4] pS/m) Liquids Methylene Chloride 4300 1.8 x [10.sup.-2] Pentachloroethane
100 0.3 Non-Conductive (<50 pS/m) Liquids Heptane 3 x [10.sup.2] ~100 Hexane 1 x [10.sup.5] ~100 Toluene <1 21 Xylene 0.1 ~100
Hauser and Bernstein  also used almost the same type of mechanism during the pyrolysis of pentachloroethane. A summary of these reactions with supporting references is given in Table-1 [6, 11- 13].
Aver'yanov, Kinetics and mechanism of thermal decomposition of 1,1,2,2-tetrachloroethane and pentachloroethane in the gas phase, Kinet.
The reagents of hexachloroethane, pentachloroethane, tetrachloroethylene, trichloroethylene, and dichloroethylene were all HPLC grade and were purchased from the Sigma Company.
The results of this experiment clearly indicated that, apart from transformation to PCE via [beta] reductive elimination, HCA can also undergo hydrogenolysis to produce pentachloroethane (PCA) and tetrachloroethane (TeCA) and then trichloroethane (TCA) and dichloroethane (DCA).