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O-Functionalised NHC Ligands for Efficient Nickel-catalysed C-O Hydrosilylation.
Journal article

O-Functionalised NHC Ligands for Efficient Nickel-catalysed C-O Hydrosilylation.

  • Bertini S Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland.
  • Albrecht M Departement für Chemie und Biochemie, Universität Bern, Freiestrasse 3, CH-3012 Bern, Switzerland;, Email: martin.albrecht@dcb.unibe.ch.
  • 2020-06-21
Published in:
  • Chimia. - 2020
General Chemistry
General Medicine
English A series of C,O-bidentate chelating mesoionic carbene nickel(ii) complexes [Ni(NHC^PhO)₂] (NHC = imidazolylidene or triazolylidene) were applied for hydrosilylation of carbonyl groups. The catalytic system is selective towards aldehyde reduction and tolerant to electron-donating and -withdrawing group substituents. Stoichiometric experiments in the presence of different silanes lends support to a metal-ligand cooperative activation of the Si-H bond. Catalytic performance of the nickel complexes is dependent on the triazolylidene substituents. Butyl-substituted triazolylidene ligands impart turnover numbers up to 7,400 and turnover frequencies of almost 30,000 h-1, identifying this complex as one of the best-performing nickel catalysts for hydrosilylation and demonstrating the outstanding potential of O-functionalised NHC ligands in combination with first-row transition metals.
Language
  • English
Open access status
gold
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Persistent URL
https://sonar.ch/global/documents/447
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