The catalytic dechlorination of chlorinated ethylenes by chlorotris(triphenylphosphine) rhodium was described. Reaction kinetics was conducted using 1H and 31P NMR spectroscopy under ambient conditions. Evidence for sequential chlorine removal was obtained, such that trichloroethylene yields cis-dichloroethylene yields vinyl chloride yields ethylene. The ethylene product was subsequently dimerized to butene. This is an abstract of a paper presented at the 230th ACS National Meeting (Washington, DC 8/28/2005-9/1/2005).