Hydrogen-Transfer Catalysis with Pincer-Aryl Ruthenium (II) Complexes
Paulo Dani, Thomas Karlen, Robert A. Gossage, Serafino Gladiali and Gerard van Koten*
*Debey Institute, Departement of Metal-Mediated Synthesis, Utrecht University, Padualaan 8, 3584 CH Utrecht (The Netherlands), Email: g.vankotenchem.uu.nl
P. Dani, T. Karlen, R. A. Gossage, S. Gladiali, G. van Koten, Angew. Chem. Int. Ed., 2000, 39, 743-745.
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Pincer-aryl ruthenium(II) complexes form active catalysts in the reduction of ketones by hydrogen transfer in iPrOH using KOH as promoter. At a KOH/Ru molar ratio of 20/1 only trace amounts of aldol products are formed. Under these conditions, the σ Ru-C bond is stable and the [Ru(PCP)PPh3] fragment is preserved.
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