The synthesis and reactions of an anionic tungsten–carbyne complex stabilised by the carbaborane ligand 1,2-C2B9H9Me2; evidence for a novel cage hydroboration reaction

Abstract

The salt [N(Ph₃)₂][W(CR)(CO)₂(η⁵-1,2-C₂B₉H₉Me₂)](R = C₆H₄Me-4) reacts with the compounds [RhCl(PPh₃)₃], [Rh(PPh₃)₂(diene)][BF₄](diene = cyclo-octa-1,5-diene or norbornadiene), and [AuCl(PPh₃)] to give products with tungsten–rhodium or tungsten–gold bonds, the structures of which were determined by X-ray diffraction; that from the norbornadiene complex contains a nortricyclane moiety bonded to a boron atom of the C₂B₉ cage.