Direct Evidence for the Attack of a Free N-Heterocyclic Carbene at a Carbonyl Ligand: A Zwitterionic Osmium Carbonyl Cluster

Direct Evidence for the Attack of a Free N-Heterocyclic Carbene at a Carbonyl Ligand: A Zwitterionic Osmium Carbonyl Cluster

A key suspect arrested: The initial site of attack of a free N‐heterocyclic carbene (NHC) on the triosmium carbonyl cluster [Os3(CO)12] was found to be a carbonyl ligand. The stable zwitterionic species thus formed (blue background in the scheme) was characterized crystallographically. CO substituti...

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Veröffentlicht in:Angewandte Chemie International Edition 2013-11, Vol.52 (46), p.12110-12113
Hauptverfasser: Liu, Yu, Ganguly, Rakesh, Huynh, Han Vinh, Leong, Weng Kee
Format: Artikel
Sprache:eng
Schlagworte:
Carbenes
Carbon monoxide
carbonyl complexes
Carbonyls
Clusters
Crystallography
Ligands
N-heterocyclic carbenes
nucleophilic substitution
Osmium
osmium clusters
zwitterions
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Zusammenfassung:A key suspect arrested: The initial site of attack of a free N‐heterocyclic carbene (NHC) on the triosmium carbonyl cluster [Os3(CO)12] was found to be a carbonyl ligand. The stable zwitterionic species thus formed (blue background in the scheme) was characterized crystallographically. CO substitution proceeds from this intermediate by the loss of a CO group and migratory deinsertion.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.201307102