Controlled Hydrosilylation of Carbonyls and Imines Catalyzed by a Cationic Aluminum Alkyl Complex
作者:Jürgen Koller、Robert G. Bergman
DOI:10.1021/om2008277
日期:2012.4.9
The synthesis, characterization, and unprecedented catalytic activity of cationic aluminum alkyl complexes toward hydrosilylation are described. X-ray crystallographic analysis of Tp*AlMe2 (1) and [Tp*AlMe][I-3] (3) revealed the preference of Al for a tetrahedral coordination environment and the versatility of the Tp* ligand in stabilizing Al in bi- and tridentate coordination modes. [Tp*AlMe][MeB(C6F5)(3)] (2) is highly active toward the hydrosilylation of a wide variety of carbonyls and imines, thus providing an inexpensive and versatile alternative to late transition metal catalysts.
作者:Ramkumar Kannan、Selvakumar Balasubramaniam、Sandeep Kumar、Raju Chambenahalli、Eluvathingal D. Jemmis、Ajay Venugopal
DOI:10.1002/chem.202002006
日期:2020.10.6
[(Me2NC6H4)Bi(L)3]2+ (L=aldehyde/ketone), evidenced by NMR spectroscopy in solution and by single‐crystal X‐ray diffraction in the solid state. It efficiently catalyzes hydrosilylation of aldehydes and ketones resulting in silyl ethers as the only products in high yields. Our investigations support a carbonyl activation mechanism at the bismuth center followed by Si−H addition.
铋化合物作为过渡金属配合物和电子贫乏的轻质p嵌段化合物在均相催化中的潜在替代品正变得越来越重要。通过分离[Me 2 NC 6 H 4 } Bi OP(NMe 2)3 } 3,实验证明了具有三个亲电位点的双坐标[(Me 2 NC 6 H 4)Bi] 2+的计算分析。] [B(3,5-C 6 H 3 Cl 2)4 ] 2。这些观察结果使我们产生了有机二有机铋催化剂,[(Me 2NC 6 H 4)Bi(L)3 ] 2+(L =醛/酮),通过溶液中的NMR光谱和固态的单晶X射线衍射证明。它有效地催化醛和酮的氢化硅烷化反应,从而使甲硅烷基醚成为唯一的高收率产品。我们的研究支持铋中心的羰基活化机理,然后再加入Si-H。