Highly efficient N-heterocyclic carbene/ruthenium catalytic systems for the acceptorless dehydrogenation of alcohols to carboxylic acids: Effects of ancillary and additional ligands

Wan Qiang Wang, Hua Cheng, Ye Yuan, Yu Qing He, Hua Jing Wang, Zhi Qin Wang, Wei Sang, Cheng Chen, Francis Verpoort

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The transition-metal-catalyzed alcohol dehydrogenation to carboxylic acids has been identified as an atom-economical and attractive process. Among various catalytic systems, Ru-based systems have been the most accessed and investigated ones. With our growing interest in the discovery of new Ru catalysts comprising N-heterocyclic carbene (NHC) ligands for the dehydrogenative reactions of alcohols, we designed and prepared five NHC/Ru complexes ([Ru]-1–[Ru]-5) bearing different ancillary NHC ligands. Moreover, the effects of ancillary and additional ligands on the alcohol dehydrogenation with KOH were thoroughly explored, followed by the screening of other parameters. Accordingly, a highly active catalytic system, which is composed of [Ru]-5 combined with an additional NHC precursor L5, was discovered, affording a variety of acid products in a highly efficient manner. Gratifyingly, an extremely low Ru loading (125 ppm) and the maximum TOF value until now (4800) were obtained.

Original languageEnglish
Article number10
JournalCatalysts
Volume10
Issue number1
DOIs
Publication statusPublished - Jan 2020

Keywords

  • Additional ligands
  • Ancillary ligands
  • Carboxylic acids
  • N-heterocyclic carbenes (NHCs)
  • Ruthenium (Ru)

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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