Synthesis of µ2-η1 and µ2-η2 bridged alkyne diplatinum complexes, and the mechanism of formation of cationic bridged-vinyl species by protonation of diplatinacyclobutenes

Abstract

Reaction of [Pt(cod)₂](cod = cyclo-octa-1,5-diene) with [Pt(η²-CF₃C₂CF₃)(cod)] affords a mixture of two isomers [Pt₂{µ-(η²-CF₃C₂CF₃)}(cod)₂] and [Pt₂{µ-(η¹-CF₃C₂CF₃)}(cod)₂]; treatment of the latter or [Pt₂{µ-(η¹-4,4′-MeOC₆F₄C₂C₆F₄OMe)}(cod)₂] with HBF₄ gives cationic bridged hydrides, which rearrange to form diplatinum bridged vinyl compounds.