Highly efficient abnormal NHC ruthenium catalyst for Oppenauer-type oxidation and transfer hydrogenation reactions

Lorenz Pardatscher, Benjamin J. Hofmann, Pauline J. Fischer, Sebastian M. Hölzl, Robert M. Reich, Fritz E. Kühn, Walter Baratta

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9 Citations (Scopus)

Abstract

The ruthenium complex [Ru(OAc)(a-PC)2]Br (3) containing two abnormal NHC ligands is obtained by reaction of Ru(OAc)2(PPh3)2 (1) with 1-(2-diphenylphosphinoethyl)-3-mesitylimidazolium bromide in the presence of NaOAc. Complex 3 catalyzes the Oppenauer-type oxidation of a number of alcohols at unrivalled reaction rates reaching TOFs up to 550 000 h-1, at low catalyst loadings (S/C higher than 10 000) and using acetone in stoichiometric amounts. Complex 3 is also highly active in the reverse transfer hydrogenation of several ketones with 2-propanol, displaying TOFs up to 600 000 h-1.
Original languageEnglish
Pages (from-to)11302-11306
Number of pages5
JournalACS Catalysis
Volume9
Issue number12
Early online date4 Nov 2019
DOIs
Publication statusPublished - 6 Dec 2019

Keywords

  • alcohols
  • carbonyl compounds
  • N-heterocyclic carbenes
  • Oppenauer-type oxidation
  • ruthenium
  • smart ligands
  • transfer hydrogenation

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