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Issue 27, 2012
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New catalysts with unsymmetrical N-heterocyclic carbene ligands

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The importance of unsymmetrical N-heterocyclic carbenes (uNHCs) as ligands in metal-catalyzed reactions is undeniable. While uNHCs show similar properties as compared with symmetrical NHCs, dissymmetrization allows for further fine-tuning. The introduction of chelatization, hemilability, bifunctionality, shielding effects, and chirality-transfer influences the catalyst’s stability, reactivity, and selectivity, thus offering access to tailor-made systems including mono- and multidentate uNHC ligands. Based on selected examples, the structure–reactivity relationship of uNHCs employed in metal catalysts is presented. The focus is on catalytically active complexes, which either offer access to new applications or lead to significantly improved results in metal-catalyzed reactions.

Graphical abstract: New catalysts with unsymmetrical N-heterocyclic carbene ligands

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Publication details

The article was received on 03 Feb 2012, accepted on 05 Apr 2012 and first published on 15 May 2012

Article type: Perspective
DOI: 10.1039/C2DT30256J
Citation: Dalton Trans., 2012,41, 8215-8225
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    New catalysts with unsymmetrical N-heterocyclic carbene ligands

    J. Tornatzky, A. Kannenberg and S. Blechert, Dalton Trans., 2012, 41, 8215
    DOI: 10.1039/C2DT30256J

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