Journal
CATALYSTS
Volume 10, Issue 1, Pages -Publisher
MDPI
DOI: 10.3390/catal10010010
Keywords
ruthenium (Ru); N-heterocyclic carbenes (NHCs); carboxylic acids; ancillary ligands; additional ligands
Categories
Funding
- National Natural Science Foundation of China [21502062]
- Scientific Research Program Guiding Project of Hubei Provincial Department of Education [B2019135]
- Teacher's Scientific Research Ability Cultivation Fund, Hubei University of Arts and Science (Natural Science) [2018kypy001]
- Open Foundation of Discipline of Hubei University of Arts and Science [XK2019038]
- Tomsk Polytechnic University Competitiveness Enhancement Program [VIU69-2019]
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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.
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