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Issue 26, 2012
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Oxidation of dimethyldi(2-pyridyl)borato PtIIMen complexes, n = 1, 0, with H2O2: tandem B-to-Pt methyl group migration and formation of C–O bond

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Abstract

New dimethyldi(2-pyridyl)borato (dmdpb) platinum(II) complexes, (dmdpb)PtIIMe(SMe2) (1), (dmdpb)PtII(L)(SMe2)+, L = MeOH (2), MeCN (3), supported by dimethylsulfide ligand and featuring one (1) or no hydrocarbyls at the metal (2, 3) were prepared and their oxidation with hydrogen peroxide was studied. Both complex 1 bearing the formal charge of +1 on the metal and the methanol complex 2 capable of losing the proton of the methanol ligand to form the methoxide derivative 4 charged similarly to 1, are reactive towards H2O2. However, the cationic complex 3 with a formal charge of +2 on the metal does not react with H2O2. The oxidation of the monomethyl platinum(II) complex 1 leads to the B-to-Pt methyl transfer and formation of a robust dimethyl PtIV species 5 which does not undergo C–O reductive elimination up to 100 °C. By contrast, oxidation of 2 in methanol-d4 leads to quantitative formation of dimethyl ether-d3, CD3OCH3. It was presumed that the latter reaction involves the B-to-Pt methyl transfer and formation of a highly reactive cationic monomethyl PtIV species whose methyl group carbon atom can accept nucleophilic attack by the methanol-d4 solvent to form dimethyl ether-d3.

Graphical abstract: Oxidation of dimethyldi(2-pyridyl)borato PtIIMen complexes, n = 1, 0, with H2O2: tandem B-to-Pt methyl group migration and formation of C–O bond

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Article information


Submitted
20 Jan 2012
Accepted
07 May 2012
First published
10 May 2012

Dalton Trans., 2012,41, 8116-8122
Article type
Paper

Oxidation of dimethyldi(2-pyridyl)borato PtIIMen complexes, n = 1, 0, with H2O2: tandem B-to-Pt methyl group migration and formation of C–O bond

S. Pal and A. N. Vedernikov, Dalton Trans., 2012, 41, 8116
DOI: 10.1039/C2DT30905J

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