Hydrogenation of Alkenes Catalyzed by Mn(I) Alkyl Complexes Bearing NHC Phosphine Ligands

25/11/2024

An efficient additive free hydrogenation of alkenes with molecular hydrogen is described. The pre-catalyst is a well-defined bench stable Mn(I) alkyl complex bearing a NHC phosphine ligand. These reactions are environmentally benign and atom economic, implementing an inexpensive, earth abundant non-precious metal catalyst. The catalytic process is initiated by migratory insertion of a CO ligand into the Mn-alkyl bond to yield an acyl intermediate which undergoes rapid hydrogenolysis to form the active 16e Mn(I) hydride catalyst [Mn(PC-iPr)(CO)2(H)]. A range of mono- and disubstituted alkenes were efficiently converted into alkanes in good to excellent yields. The hydrogenation requires a reaction temperature of 60 °C. In all cases, a catalyst loading of 1 mol % and a hydrogen pressure of 50 bar was applied. A mechanism based on DFT calculations is presented which is supported by experimental studies.

Autores da comunidade :

• 

  L

  Luís Filipe Coelho Veiros

  ist12434

  Afiliações e fontes

  IST > CQE

  Centro de Química Estrutural

  IST > DEQ

  Departamento de Engenharia Química

VoR - Versão publicada

Wiley

ChemCatChem

e202401172

e202401172

16

22

1867-3899

10.1002/cctc.202401172

001339838600001

chemical-sciences - Química

eng - Inglês

CC-BY - CC-BY