Alkynylsilanes – a missing piece of different silylation agents, can serve as valuable substrates in the O‐silylation through a dealkynative coupling with alcohols or silanols. The described approach displays a whole array of advantages in terms of green chemistry and is a promising alternative to existing methodologies.
Cobalt-Catalyzed Selective Synthesis of Disiloxanes and Hydrodisiloxanes
作者:Sandip Pattanaik、Chidambaram Gunanathan
DOI:10.1021/acscatal.9b00305
日期:2019.6.7
independent experiments confirmed the catalytic oxidation of silane to silanol, and further dehydrocoupling processes are involved in syntheses of symmetrical siloxanes, cyclotetrasiloxanes, and siloxane cage compounds, whereas the unsymmetrical monohydrosiloxane syntheses from silanes and silanols proceeded via dehydrogenative coupling reactions. Overall these cobalt-catalyzed oxidative coupling reactions
分别从硅烷和二氢硅烷与水的反应中获得对称的硅氧烷和环四硅氧烷的选择性合成,并且该反应由NNN H t Bu钴(II)钳形配合物催化。有趣的是,当苯硅烷用水进行催化时,获得了由12个硅和18个氧中心组成的硅氧烷笼,反应明显进行,释放出3当量的分子氢(36 H 2)在温和的实验条件下。在硅烷与不同的硅烷醇反应后,通过钴催化实现了高选择性和受控的高级单氢硅氧烷和二甲氧基单氢硅烷的合成。释放的分子氢是在所有这些转化中观察到的唯一副产物。机理研究表明,反应是通过均质途径发生的。动力学和独立实验证实了硅烷催化氧化为硅烷醇的过程,并且进一步的脱氢偶联过程还涉及对称硅氧烷,环四硅氧烷和硅氧烷笼型化合物的合成,而硅烷和硅烷醇的不对称一氢硅氧烷则通过脱氢偶联反应进行合成。总体而言,这些钴催化的氧化偶联反应基于Si–H,Si–OH,和硅烷,硅烷醇和水的O–H键活化。建议使用由Co(II)中间体组成的催化循环。
Highly Efficient Iridium-Catalyzed Oxidation of Organosilanes to Silanols
作者:Youngjun Lee、Dong Seomoon、Sundae Kim、Hoon Han、Sukbok Chang、Phil Ho Lee
DOI:10.1021/jo035647r
日期:2004.3.1
Hydrolytic oxidation of organosilanes to the corresponding silanols can be performed highlyefficiently with a catalyst system of [IrCl(C8H12)]2 under essentially neutral and mild conditions, and various types of silanols are produced in good to excellent yields.
使用[IrCl(C 8 H 12)] 2催化剂体系,可以在基本上中性和温和的条件下高度有效地将有机硅烷水解氧化为相应的硅烷醇,并且可以以良好至极好的收率生产各种类型的硅烷醇。
Contributions to the chemistry of silicon-sulphur compounds
作者:J. Pikies、W. Wojnowski
DOI:10.1016/0022-328x(89)85359-8
日期:1989.12
The reactions of isobutyl(isopropoxy)silyl bromides i-Bun(i-PrO)3−nSiBr (n = 0–3) with H2S in the presence of Et3N yield the corresponding silanethiols, i-Bun(i-PrO)3−nSiSH. The transition energy σ → σ★ and the IP of SiS bond, as well as the first IP of sulphur lone pairs do not change significantly as the number of electronegative i-PrO groups is varied. The geminal anomeric effects seems to be the
在Et 3 N存在下,异丁基(异丙氧基)甲硅烷基溴i-Bu n(i-PrO)3 - n SiBr(n = 0-3)与H 2 S反应生成相应的硅烷硫醇i-Bu n( i-PrO)3 - n SiSH。随着电子负性i-PrO基团数目的变化,跃迁能σ→σ ★和SiS键的IP以及硫孤对的第一个IP不会显着变化。双异头效应似乎是i-Bu(i-PrO)2 SiSH和i-Bu(i-PrO)2 SiH反应性提高的原因。
Supported gold nanoparticle catalyst for the selective oxidation of silanes to silanols in water
Hydroxyapatite-supported goldnanoparticles (AuHAP) can act as highlyefficient and reusable catalysts for the oxidation of diverse silanes into silanols in water; this is the first catalytic methodology for the selective synthesis of aliphatic silanols using water under organic-solvent-free conditions.