Abstract
A theoretical investigation at the gradient-corrected density functional (BP86) level of theory on the iodo-methyl ligand exchange reaction in platinum–diphosphine complexes is discussed. The reaction consists of two elementary steps: the oxidative addition of methyl–iodide, and reductive elimination of ethane from the intermediate Pt(bdpp)(CH 3) 3I complex which is the rate determining step with a free energy of activation of 19.5 kcal/mol in acetonitrile phase. The oxidative addition step takes place with S N2 mechanism via a transition state with a collinear arrangement of the I–CH 3–Pt moiety.
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