期刊
CHEMISTRY-A EUROPEAN JOURNAL
卷 15, 期 37, 页码 9375-9386出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.200900249
关键词
coordination modes; electronic tuning; metal nucleophilicity; N-heterocyclic carbene ligands; palladium
资金
- Swiss National Science Foundation
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 H-2 activation with abnormal carbene complexes under mild conditions, leading to a catalytic process for the hydrogenation of olefins.
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