The gas phase kinetics of the bromine catalyzed elimination of HC1 from 1,lJ-trichloroethane has been studied over a five fold variation of (CH,CCl,)/(Br,) and from 565 to 634 K. The most important reactions in the mechanism are found to be:The preferred analysis of the kinetic data results in log(h,/M-' s ' 1 = 11.3 i 0.3 -(19.9 5 1.0) x 103/4.575 T. From these results one calculates the C-H bond dissociation energy in CH,CCl, to be 103.8 k 2 kcal mol-', and the heat of formation of 2,2.2-trichloroethyl to be 17.7 & 2 kcal mol-'.