Reactivity of Organogold Compounds with B(C₆F₅)₃: Gold–Boron Transmetalation via σ‑B/π-Au Species

The reactions of gold-acetylides with B­(C₆F₅)₃ afford alkynyl borate species and cationic π-coordinated gold complexes. The analogous reactions with aryl gold species generate <i>gem</i>-diaurated compounds containing a borate counteranion. These new σ-B/π-Au alkynyl borate complexes can be employed as active catalysts in homogeneous catalysis and represent a new silver-free activation pathway. The new alkynyl borate species are fully characterized, and the alkyne fragments are shown to be bound in a σ-B/π-Au fashion. Upon prolonged heating, these compounds undergo a slow C₆F₅ group transfer to gold affording LAuC₆F₅ species