Reaction of Bis(pentafluorophenyl)borane with Methylidyne Complexes:  Synthesis and Characterization of a Cationic Tungsten(VI) Borylalkylidyne Hydride

Reaction of the tungsten methylidyne complexes (dmpe)2W(X)⋮CH (X = Cl, OTf) with HB(C6F5)2 yields zwitterionic compounds upon electrophilic attack of the methylidyne ligand, in which the methylidyne hydrogen is strongly α-agostic (X = Cl) or is transferred to the tungsten center (X = OTf). Removal of hydride from the coordinated HB(C6F5)2 with [Ph3C]+[B(C6F5)4]- gives a cationic borylalkylidyne hydride species.