Gold(III) alkyne complexes: Bonding and reaction pathways

Luca Rocchigiani, Julio Fernandez-Cestau, Gabriele Agonigi, Isabelle Chambrier, Peter Budzelaar, Manfred Bochmann

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Abstract

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.
Original languageEnglish
Pages (from-to)13861–13865
Number of pages5
JournalAngewandte Chemie International Edition
Volume56
Issue number44
Early online date2 Oct 2017
DOIs
Publication statusPublished - 23 Oct 2017

Keywords

  • alkynes
  • density functional calculations
  • gold
  • homogeneous catalysis
  • reaction mechanisms

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