设计一种新的生物质增值方法对于创造可持续的未来至关重要。在这项工作中,我们报告了一种有效的基于氢化硅烷化的策略,用于将生物质衍生的乙酰丙酸及其衍生物选择性增值为增值化学品,如戊烷-1,4-二醇、戊烷-2-醇、2-MTHF 和在室温下,通过使用经济高效且无毒的硅烷和市售催化剂 B(C 6 F 5 ) 3,甚至可以合成 C 5碳氢化合物。
设计一种新的生物质增值方法对于创造可持续的未来至关重要。在这项工作中,我们报告了一种有效的基于氢化硅烷化的策略,用于将生物质衍生的乙酰丙酸及其衍生物选择性增值为增值化学品,如戊烷-1,4-二醇、戊烷-2-醇、2-MTHF 和在室温下,通过使用经济高效且无毒的硅烷和市售催化剂 B(C 6 F 5 ) 3,甚至可以合成 C 5碳氢化合物。
Hydrosilylation of epoxides catalyzed by a cationic η1-silane iridium(iii) complex
作者:Sehoon Park、Maurice Brookhart
DOI:10.1039/c0cc05714b
日期:——
Cationic silane complex 2, catalyzes the hydrosilylation of epoxides and cyclic ethers to give the silyl-protected alcohols, regioselectively. A mechanistic study shows that the epoxide undergoes isomerization to the ketone, followed by hydrosilylation.
Etude de l'obtention d'enoxysilanes par action du triethylsilane sur des cetones enolisables, aliphatiques ou cyclaniques, en presence de catalyseurs au nickel
alkenoxysilanes has been achieved by the reaction of enolizable aliphatic or cyclic ketones with triethylsilane in the presence of nickel catalysts. For some catalysts, the reaction can be directed to give exclusively one or the other of these derivatives. The use of certain nickel catalysts gives very high yields of alkenoxysilanes, and this has been closely investigated.
Nanoparticulate intermetallic compound Ni3Ga supported on SiO2 has emerged as a highly efficient catalyst for the hydrosilylation of carbonyls, such as aldehydes and ketones, at room temperature.
Alcoholysis Equilibria of Triethylalkoxysilanes Catalyzed by Iodine or Iodine Monobromide
作者:Katsuko Ito、Takeshi Ibaraki
DOI:10.1246/bcsj.55.2973
日期:1982.9
The equilibrium constants K of alcoholysis of triethylalkoxysilanes were determined at 20 °C and 40 °C. Iodinemonobromide was used to promote the reactions associated with the tertiary alkoxyl groups, while the other reactions proceeded in the presence of iodine. The K values of the reaction systems with ethoxyl or propoxyl—primary, secondary, and tertiary alkoxyl pairs were 1 or above, about 0.5
三乙基烷氧基硅烷醇解的平衡常数 K 在 20 °C 和 40 °C 下测定。一溴化碘用于促进与叔烷氧基相关的反应,而其他反应在碘存在下进行。具有乙氧基或丙氧基-伯、仲和叔烷氧基对的反应体系的K值分别为1或更高、约0.5和约0.05。这些值反映了烷氧基与硅的结合能力的程度,其顺序为一级>二级>三级烷氧基。假定反应的机理涉及碘或一溴化碘的参与。
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。