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

Результат исследований: Материалы для журналаСтатья

Аннотация

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.

Язык оригиналаАнглийский
Номер статьи10
ЖурналCatalysts
Том10
Номер выпуска1
DOI
СостояниеОпубликовано - янв 2020

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry

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