Facile Styrene Formation from Ethylene and a Phenylplatinum(II) Complex Leading to an Observable Platinum(II) Hydride

Abstract

A new 2-(di-tert-butylphosphanyl)­benzenesulfonate-supported phenylplatinum­(II) complex instantaneously but reversibly binds ethylene at room temperature. Direct and rapid styrene formation at room temperature via insertion of the PtII-bound ethylene into the PtII–Ph fragment followed by β-hydride elimination results in the formation of a solution-stable PtII–H complex. The PtII–H fragment is resistant toward protonolysis by acetic acid. Oxidation of the PtII–H fragment by excess CuII(OTf)2 leads to an inorganic PtII complex incapable of C–H activation.

Olefin Hydroarylation Catalyzed by (pyridyl-indolate)Pt(II) Complexes: Catalytic Efficiencies and Mechanistic Aspects

“…In a recent publication by Nozaki, complexes of the type [(P–O)­PtPh­(L)] supported by a 2-(di- tert- butylphosphanyl)­benzenesulfonate ligand were employed as precursors in the generation of stable Pt–hydride species by treatment with ethylene. Olefin insertion from these PtPh complex was suggested to generate a Pt­(CH 2 CH 2 Ph) fragment, although such species were not directly observed.…”