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In addition to the qualitative evidence described in ref 4c in support of a rate dependence on added silane, a quantitative study of the rate dependence on [silane] in the reaction depicted in eq 2 reveals a nonlinear dependence on [silane] (i.e., saturation kinetics) according to a mechanism involving reversible, rate-limiting dissociation of silane to form A, followed by a faster "trapping" step involving EtOAc. Legzdins, P.; Lumb, S. A. Unpublished results. Because the second step is the microscopic reverse of the first, it follows that the C-H activation step is also reversible.
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