Cationic platinum(II) complexes: platinum–alkyl bond cleavage by a powerful Lewis acid

Abstract

Treatment of [PtCl(Me)(dbbipy)] or [PtCl₂(dbbipy)](dbbipy = 4,4′-di-tert-butyl-2,2′-bipyridine) with AgX (X = SO₃CF₃ or O₂CCF₃) gave the complexes [PtMe(SO₃CF₃)(dbbipy)]1, [Pt(SO₃CF₃)₂(dbbipy)]2 and [Pt(O₂CCF₃)₂(dbbipy)]5. The complexes [PtCl(SO₃CF₃)(dbbipy)]3 and [PtMe(O₂CCF₃)(dbbipy)]4 were prepared by the addition of HX to [PtCl₂(dbbipy)] or [PtMe₂(dbbipy)], respectively. Complex 1 reacted with CO to give the cationic carbonyl complex [PtMe(CO)(dbbipy)][SO₃CF₃]6a, which reacted with NEt₂H to give an equilibrium with the corresponding carbamyl complex [Pt(CONEt₂)Me(dbbipy)]7. In the first example of alkyl-ligand abstraction from a late-transition-metal complex by the powerful Lewis acid B(C₆F₅)₃, the complexes [PtMeL(dbbipy)][BMe(C₆F₅)₃](L = CO 6b or C₂H₄8) were readily prepared from [PtMe₂(dbbipy)] and B(C₆F₅)₃ in the presence of L.