Activation parameters for additions of ambiphilic methoxychlorocarbene to alkenes.

Activation parameters are determined for the additions of methoxychlorocarbene (MeOCCl) to four alkenes, including tetramethylethylene (TME). MeOCCl is the first carbene to exhibit appreciable activation energy in addition to TME (5.8 kcal/mol), although this reaction is still "dominated" by entropy (-TDeltaS(double dagger) approximately 7 kcal/mol).