title: Synthesis of palladium(0) and -(II) complexes with chelating bis(N-heterocyclic carbene) ligands and their application in semihydrogenation.
abstract: A transmetallation route, using silver(I) precursors, to several zero- and di-valent palladium complexes with chelating bis(N-heterocyclic carbene) ligands bearing various N-substituents has been established. The resulting complexes have been characterized by NMR and mass spectroscopy. In addition, the structure of a representative compound, [Pd(0)(bis-(Mes)NHC)(η(2)-ma)] (3a), was confirmed by X-ray crystal structure determination. In contrast to the transfer semihydrogenation, in which only low activity was observed, complex 3a showed activity (TOF = 49 mol(sub) mol(cat)(-1) h(-1)) and selectivity comparable to its monodentate counterparts in the semihydrogenation of 1-phenyl-1-propyne with molecular hydrogen.
authors: Van't Hoff Institute of Molecular Sciences, University of Amsterdam, PO Box 94157, 1090 GD, Amsterdam, Netherlands.
authors: Soraya N
authors: SN
authors: Sluijter
authors: Stefan
authors: S
authors: Warsink
authors: Martin
authors: M
authors: Lutz
authors: Cornelis J
authors: CJ
authors: Elsevier