genation and/or dehydrohalogenation; this class of alkenes may be defined by the following general formula: m Re Re 8 graph above, X is chlorine, bromine or fluorine and R is an alkyl or substituted alkyl group which contains two adjacent carbon atoms represented as: intermolecular C F2010 ClzOF OF OI deiodination CFZOIC GlzCF 0 F 01 intramolecular I deehlorination 0 RFC ClOF C FzCl CFFC ClOFOFzCl