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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
Cobalt Complexes Supported by Phosphinoquinoline Ligands for the Catalyzed Hydrosilylation of Carbonyl Compounds
Pauline Schiltz1, Nicolas Casaretto1, Audrey Auffrant1
1Laboratoire de Chimie Moléculaire (LCM) CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91120, Palaiseau, France.
Abstract:
P,N phosphinoquinoline based ligands differing by the nature of the phosphorus substituent (i Pr, Ph) were employed to synthesize a series of cobalt(II) complexes ([LCoBr2 ], [L2 CoBr](PF6 ) and [L'2 CoBr](PF6 )). The latter were obtained in high yield and characterized among others by X-ray analysis and elemental analysis. Complex [L2 CoBr](PF6 ) showed a very good catalytic activity for the hydrosilylation of various ketones. The catalysis proceeds at a low catalytic loading (1 mol %) with only 1 equivalent of Ph2 SiH2 in mild conditions and was efficient with aliphatic or aromatic ketones giving moderate to excellent yields of the corresponding silylated ether.
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