Methylplatinum(II) and Molecular Oxygen: Oxidation to Methylplatinum(IV) in Competition with Methyl Group Transfer To Form Dimethylplatinum(IV)

Reaction of molecular oxygen with the methylplatinum(II) complex K[(κ 2 -NNO)Pt II (CH 3 )(OH)] ( 3; NNO = bis(3,5-dimethylpyrazol-1-yl)acetate) in D 2 O results in oxidation to (κ 3 -NNO)Pt IV (CH 3 )(OD) 2 along with competitive methyl transfer to produce (κ 3 -NNO)Pt IV (CH 3 ) 2 (OD). Methyl transfer is favored under more alkaline conditions and at higher temperatures. Mechanistic studies are consistent with the direct reaction of 3 with molecular oxygen as a common first reaction step on the path to both products.