Issue 36, 2023

Synthesis and catalytic activity of well-defined Co(i) complexes based on NHC–phosphane pincer ligands

Abstract

A new methodology for the preparation of Co(I)–NHC (NHC = N-heterocyclic carbene) complexes, namely, [Co(PCNHCP)(CO)2][Co(CO)4] (1) and [Co(PCNHCP)(CO)2]BF4 (2), has been developed (PCNHCP = 1,3-bis(2-(diphenylphosphanyl)ethyl)-imidazol-2-ylidene). Both complexes can be straightforwardly prepared by direct reaction of their parent imidazolium salts with the Co(0) complex Co2(CO)8. Complex 1 efficiently catalyses the reductive amination of furfural and levulinic acid employing silanes as reducing agents under mild conditions. Furfural has been converted into a variety of secondary and tertiary amines employing dimethyl carbonate as the solvent, while levulinic acid has been converted into pyrrolidines under solventless conditions. Dehydrocoupling of the silane to give polysilanes has been observed to occur as a side reaction of the hydrosilylation process.

Graphical abstract: Synthesis and catalytic activity of well-defined Co(i) complexes based on NHC–phosphane pincer ligands

Supplementary files

Article information

Article type
Paper
Submitted
13 Feb 2023
Accepted
08 Aug 2023
First published
15 Aug 2023
This article is Open Access
Creative Commons BY-NC license

Dalton Trans., 2023,52, 12779-12788

Synthesis and catalytic activity of well-defined Co(I) complexes based on NHC–phosphane pincer ligands

A. Luque-Gómez, P. García-Orduña, F. J. Lahoz and M. Iglesias, Dalton Trans., 2023, 52, 12779 DOI: 10.1039/D3DT00463E

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