Baeyer−Villiger Oxidation of Ketones Catalyzed by Platinum(II) Lewis Acid Complexes Containing Coordinated Electron-Poor Fluorinated DiphosphinesClick to copy article linkArticle link copied!
Abstract

The synthesis and characterization of new hydroxo-bridged platinum(II) complexes of the type [P(μ-OH)(P−P)]2[BF4]2 (1−4), where P−P = (C6H5-nFn)2PCH2CH2P(C6H5-nFn)2 (n = 2 (2Fdppe) (1), 3 (3Fdppe) (2), 4 (4Fdppe) (3), 5 (dfppe) (4), are reported. These compounds have been used in the Baeyer−Villiger oxidation of 2-methylcyclohexanone using 35% hydrogen peroxide as oxidant. The reactions were performed at 25, 50, and 70 °C in a chlorinated solvent/H2O two-phase system. Among the fluorinated catalysts, complex 4 was found to be the best one in the oxidation of cyclic ketones; however, it is ineffective toward acyclic ketones. The Lewis acidity of the platinum(II) complexes with coordinated fluorinated diphosphines was investigated through the determination of the wavenumber shift Δν̄ = ν̄(C⋮N)coord − ν̄(C⋮N)free of the isocyanide group in complexes of the type [PtCl(CN-2,6-(CH3)2C6H3)(P−P)][BF4] (P−P = 2Fdppe, 3Fdppe, 4Fdppe, dfppe, dppe). This latter parameter, which represents a measure of the electrophilicity of the metal center, was then correlated to the catalytic activity of complexes 1−4 in the Baeyer−Villiger oxidation of ketones.
*
In papers with more than one author, the asterisk indicates the name of the author to whom inquiries about the paper should be addressed.
†
Università di Padova.
‡
Università di Venezia.
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