Supported palladium nanoparticles as heterogeneous ligand-free catalysts for the Hiyama C–C coupling of vinylsilanes and halobenzenes leading to styrenes
The Hiyama C-C coupling reaction of a wide range of aryl iodides and vinylsilanes has been performed using ligand-free solid catalysts based on supported palladium nanoparticles. Among the supports tested (Mg, TiO2, CeO2 and active carbon), the most active catalysts were those in which palladium is supported on MgO and TiO2. Analogous Pt and Au materials were inefficient to promote this reaction. Leaching tests suggest that there is some contribution of dissolved Pd since Pd in solution has been detected and the scavenging test decreases the initial reaction rate. Although the solid Pd catalysts can be reused, it was, however, observed that they undergo a certain deactivation upon use that can be attributed to several factors including the presence of inorganic compounds on the catalyst, Pd leaching or agglomeration of Pd NPs. (c) 2013 Elsevier Inc. All rights reserved.
Taylor, Roger, Journal of the Chemical Society. Perkin transactions II, 1991, # 11, p. 1703 - 1706
作者:Taylor, Roger
DOI:——
日期:——
Rapid and efficient entry to vinyl silanes from aldehydes employing a novel metalation–Peterson sequence
作者:James McNulty、Priyabrata Das
DOI:10.1039/b716897g
日期:——
Bis(trimethylsilyl)chloromethane undergoes a rapid and selective metalation with s-BuLi, yielding the nucleophilic bis(trimethylsilyl)methyl anion and providing a straightforward general entry to vinyl silanes from aromatic, aliphatic and vinyl aldehydes.