Rigid pyridyl substituted NHC ligands,their Pd(0) complexes and their application in selective transfer semihydrogenation of alkynes |
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| Authors: | Stefan Warsink Suzanne Bosman Jan J. Weigand Cornelis J. Elsevier |
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| Affiliation: | 1. Molecular Inorganic Chemistry, van 't Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1090 GD Amsterdam, the Netherlands;2. Institut für Anorganische und Analytische Chemie, Westf?lische Universit?t Münster, Corrensstra?e 28/30, 48149 Münster, Germany |
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| Abstract: | The synthesis of an air‐stable series of Pd0 complexes with unsymmetric bidentate N‐pyridine N‐heterocyclic carbene ligands has been described. The carbenes were generated by synthesis of the silver(I) complexes from the imidazolium salts, followed by transmetallation of the C‐N ligands to obtain the target electron‐rich zerovalent palladium compounds. The bidentate coordination behaviour of the ligands was confirmed by 1H, 13C NMR and X‐ray spectroscopy. The complexes are active precatalysts for the selective transfer semihydrogenation of alkynes to Z‐alkenes, with selectivities up to 99%. Copyright © 2011 John Wiley & Sons, Ltd. |
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| Keywords: | carbene complexes organometallic compounds palladium transmetallation hydrogenation |
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