Hydrosilylation of a wide group of alkynes (terminal and internal) with four structurally different silanes has been for the first time performed in supercritical CO2 (scCO2). The results clearly showed the advantages as well as the limitations of using of scCO2 as a reaction and extraction medium for hydrosilylation of numerous alkynes with different functionality and volatility. Procedures for the
首次在超临界CO 2(scCO 2)中进行了多种炔烃与四种结构不同的硅烷的氢化硅烷化反应。结果清楚地表明,使用scCO 2作为反应和萃取介质对许多具有不同官能度和挥发性的炔烃进行氢化硅烷化的优势和局限性。描述了合成和分离四十多种甲硅烷基乙烯的方法,其中首次超过二十种。获得的产物通过1 H,13 C,29 Si NMR,GC-MS和EA进行了充分表征。此外,通过X射线晶体学,(E)-3-(1,1,1,3,5,5,5-七甲基三硅氧烷-3-基)-2,5-二甲基己-3-烯-2,5-二醇(3n)和(E)-三乙基首次确定了(2-(三苯基甲硅烷基)乙烯基)硅烷(12a)。
Carboxylate-Assisted β-(<i>Z</i>) Stereoselective Hydrosilylation of Terminal Alkynes Catalyzed by a Zwitterionic Bis-NHC Rhodium(III) Complex
作者:Raquel Puerta-Oteo、Julen Munarriz、Víctor Polo、M. Victoria Jiménez、Jesús J. Pérez-Torrente
DOI:10.1021/acscatal.0c01582
日期:2020.7.2
catalyst for the hydrosilylation of terminal alkynes with excellent regio- and stereoselectivity toward the less thermodynamically stable β-(Z)-vinylsilane isomer under mild reaction conditions. A broad range of linear 1-alkynes, cycloalkyl acetylenes, and aromatic alkynes undergo the hydrosilylation with HSiMe2Ph to afford the corresponding β-(Z)-vinylsilanes in quantitative yields in short reaction times