The quantitative thermal behavior of haloethanes has been a subject of consistent interest over the last half century. 1. and 2. More recently, there has been an increased interest in chlorine- and fluorine-substituted hydrochlorofluorocarbons (HCFC's) and chlorofluoroethanes in particular, because of their potential as replacements for ozone-depleting Freon refrigerants. When chlorofluoroethanes are heated in the gas phase, although free radical ...