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

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journal contribution
posted on 08.09.2014, 00:00 by Max M. Hansmann, Frank Rominger, Michael P. Boone, Douglas W. Stephan, A. Stephen K. Hashmi
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 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 C6F5 group transfer to gold affording LAuC6F5 species.