On the electronic impact of abnormal C4-bonding in N-heterocyclic carbene complexes
- Heckenroth, Marion Department of Chemistry, University of Fribourg, Switzerland
- Neels, Antonia XRD Application Lab, Neuchâtel Switzerland
- Garnier, Michael G. Physics Institute, University of Neuchâtel, Switzerland
- Aebi, Philipp Physics Institute, University of Neuchâtel, Switzerland
- Ehlers, Andreas W. Scheikundig Laboratorium, Vrije Universiteit van Amsterdam, The Netherlands
- Albrecht, Martin Department of Chemistry, University of Fribourg, Switzerland
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04.08.2009
Published in:
- Chemistry - A European Journal. - 2009, vol. 15, no. 37, p. 9375-9386
English
Sterically similar palladium dicarbene complexes have been synthesized that comprise permethylated dicarbene ligands which bind the metal center either in a normal coordination mode via C2 or abnormally via C4. Due to the strong structural analogy of the complexes, differences in reactivity patterns may be attributed to the distinct electronic impact of normal versus abnormal carbene bonding, while stereoelectronic effects are negligible. Unique reactivity patterns have been identified for the abnormal carbene complexes, specifically upon reaction with Lewis acids and in oxidative addition-reductive elimination sequences. These reactivities as well as analytical investigations using X-ray diffraction and X-ray photoelectron spectroscopy indicate that the C4 bonding mode increases the electron density at the metal center substantially, classifying such C4-bound carbene ligands amongst the most basic neutral donors known thus far. A direct application of this enhanced electron density at the metal center is demonstrated by the catalytic H₂ activation with abnormal carbene complexes under mild conditions, leading to a catalytic process for the hydrogenation of olefins.
- 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 12616
- DOI 10.1002/chem.200900249
- Persistent URL
- https://folia.unifr.ch/unifr/documents/301214
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