Reactivity of Organogold Compounds with B(C ₆ F ₅ ) ₃ : Gold–Boron Transmetalation via σ-B/π-Au Species

The reactions of gold-acetylides with B(C 6 F 5 ) 3 afford alkynyl borate species and cationic π-coordinated gold complexes. The analogous reactions with aryl gold species generate gem -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 C 6 F 5 group transfer to gold affording LAuC 6 F 5 species.