4 years ago

Gold(III) Alkyne Complexes: Bonding and Reaction Pathways

Gold(III) Alkyne Complexes: Bonding and Reaction Pathways
Luca Rocchigiani, Isabelle Chambrier, Manfred Bochmann, Peter H. M. Budzelaar, Gabriele Agonigi, Julio Fernandez-Cestau
The synthesis and characterization of hitherto hypothetical AuIII π-alkyne complexes is reported. Bonding and stability depend strongly on the trans effect and steric factors. Bonding characteristics shed light on the reasons for the very different stabilities between the classical alkyne complexes of PtII and their drastically more reactive AuIII congeners. Lack of back-bonding facilitates alkyne slippage, which is energetically less costly for gold than for platinum and explains the propensity of gold to facilitate C−C bond formation. Cycloaddition followed by aryl migration and reductive deprotonation is presented as a new reaction sequence in gold chemistry. Good as gold: The synthesis of hitherto hypothetical gold(III) π-alkyne complexes highlights the differences between classical platinum alkyne complexes and their drastically more reactive AuIII congeners. Alkyne bonding in these complexes is subject to a strong trans influence, with ligands trans to a pyridine N atom being bound significantly more strongly than those trans to an anionic C donor.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201708640

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