炔烃的氢化硅烷化是生产乙烯基硅烷化合物的有力方法,乙烯基硅烷化合物是有机化学中合成通用的有机硅试剂。在此,原子分散的Au 锚定在gC 3 N 4纳米片上被开发为炔氢化硅烷化反应的优良催化剂。通过X 射线吸收精细结构 (XAFS) 表征和分析观察到的原子 Au 物质处于 +1 氧化态,与三个氮原子配位。具有各种官能团的芳香族炔烃和脂肪族炔烃可以有效地产生相应的β-( E)-具有高转化率和选择性的乙烯基硅烷产品。原子分散的Au催化剂至少可以重复使用五个循环,而活性和选择性没有明显下降。Au I -N 3位点的独特结构和电子特性有利于 Si-H 键的连续活化,从而提高单原子位点 Au 在炔烃氢化硅烷化中的优异活性和选择性。
A Selective Synthesis of (E)-Vinylsilanes by Cationic Rhodium Complex-Catalyzed Hydrosilylation of 1-Alkynes and Tandem Hydrosilylation/Isomerization Reaction of Propargylic Alcohols to .beta.-Silyl Ketones
作者:Ryo Takeuchi、Shuichi Nitta、Dai Watanabe
DOI:10.1021/jo00115a020
日期:1995.5
(E)-Vinylsilanes were obtained with high selectivities by [Rh(COD)(2)]BF4/2PPh(3)-catalyzed hydrosilylation of 1-alkynes with triethylsilane. A wide range of 1-alkynes were used. The hydrosilylation of propargylic alcohols with triethylsilane gave (E)-gamma-silyl allylic alcohols 2h-r, a useful source of a chiral alcohol, with high selectivities in excellent yields. The reaction can be carried out without protecting the alcohol functionality. The resulting (E)-gamma-silyl allylic alcohols could be transformed into beta-silyl ketones. The isomerization was also catalyzed by [Rh(COD)(2)]BF4/2PPh(3). Furthermore, the tandem hydrosilylation-isomerization of secondary propargylic alcohols could be carried out in a one-pot procedure.
(E)-丙二烯二硅烷通过使用[Rh(COD)(2)]BF4/2PPh(3)协同催化的水硅化反应获得了高选择性,适用于多种一元炔烃底物。丙炔醇的水硅化反应产生γ-硅基 allylic 醇2h-R,并提供了一种高效产率的构象选择性高的旋多糖醇。该反应无需保护醇的功能性即可进行。由此产生的(E)-γ-硅基 allylic 醇可以通过转化得到β-硅基酮。此外,该[Rh(COD)(2)]BF4/2PPh(3)催化还可以催化丙炔醇的同分异构化反应。Furthermore, a one-pot tandem hydrosilylation-isomerization of secondary propargylic alcohols can be achieved using this approach.
Short-Chained Platinum Complex Catalyzed Hydrosilylation under Thermomorphic Conditions: Heterogeneous Phase Separation at Ice Temperature
作者:Chiao-Fan Chiu、Jinn-Hsuan Ho、Eskedar Tessema、Yijing Lu、Chia-Rui Shen、Chang-Wei Lin、Norman Lu
DOI:10.3390/molecules26020378
日期:——
chain lengths of the catalysts are used. It has been found that there exists fluorous chain assisted better selectivity towards β-(E) form in the Pt-catalyzed hydrosilylation of non-symmetric terminal alkyne when the Pt catalyst contains short fluorous chain (i.e., 4 Cs). Phenyl acetylenes showed the opposite regioselectivity due to pi-pi interaction while using the same catalyst via Markovnikov’s addition
Controlling the Regioselectivity of the Hydrosilylation Reaction in Carbon Nanoreactors
作者:William A. Solomonsz、Graham A. Rance、Mikhail Suyetin、Alessandro La Torre、Elena Bichoutskaia、Andrei N. Khlobystov
DOI:10.1002/chem.201201542
日期:2012.10.8
Hollow graphitized carbon nanofibres (GNF) are employed as nanoscale reaction vessels for the hydrosilylation of alkynes. The effects of confinement in GNF on the regioselectivity of addition to triple carbon–carbon bonds are explored. A systematic comparison of the catalytic activities of Rh and RhPt nanoparticles embedded in a nanoreactor with free‐standing and surface‐adsorbed nanoparticles reveals