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

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 [PtMe(2)(dbbipy)], respectively. Complex 1 reacted with CO to give the cationic carbonyl complex [PtMe(CO)(dbbipy)][SO3CF3] 6a, which reacted with NEt(2)H to give an equilibrium with the corresponding carbamoyl complex [Pt(CONEt(2))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 C2H4 8) were readily prepared from [PtMe(2)(dbbipy)] and B(C6F5)(3) in the presence of L.