Rhodium(iii) complexes containing C4-bound N-heterocyclic carbenes: synthesis, coordination chemistry, and catalytic activity in transfer hydrogenation
- Yang, Liangru Department of Chemistry, University of Fribourg, Switzerland - School of Chemistry and Chemical Engineering, Henan University of Techology, P. R. China.
- Krüger, Anneke Department of Chemistry, University of Fribourg, Switzerland
- Neels, Antonia Institute of Microtechnology, University of Neuchâtel, Switzerland
- Albrecht, Martin Department of Chemistry, University of Fribourg, Switzerland
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28.05.2008
Published in:
- Organometallics. - 2008, vol. 27, no. 13, p. 3161–3171
English
Direct metalation of C2-protected diimidozolium salts with RhCl₃ or [RhCl(cod)]₂ and KI afforded a series of new rhodium(III) complexes with abnormally C4-bound, cis-chelating NHC ligands. The complexes were isolated as dimetallic species containing two (μ²-I)₃-bridged rhodium(III) centers. In the presence of coordinating ligands such as CH₃CN, PPh₃, or dppe, the dimeric structure is readily cleaved and yields monometallic complexes. Crystallographic analysis of representative structures indicates a higher trans influence of abnormally C4-bound carbenes as compared to normal NHCs. The exceptionally strong donor ability of carbenes in such a C4 coordination mode increases the catalytic activity of the rhodium center and allows for efficient transfer hydrogenation of ketones in iPrOH/KOH.
- Faculty
- Faculté des sciences et de médecine
- Department
- Département de Chimie
- Language
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- English
- Classification
- Chemistry
- License
- License undefined
- Identifiers
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- RERO DOC 10551
- DOI 10.1021/om800110c
- Persistent URL
- https://folia.unifr.ch/unifr/documents/300815
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