Immobilization of a Platinum Catalyst Using the Polymer Incarcerated (PI) Method and Application to Catalytic Reactions
作者:Shu Kobayashi、Hiroyuki Hagio、Masaharu Sugiura
DOI:10.1055/s-2005-863707
日期:——
Immobilization of a platinum catalyst was carried out on the basis of the polymer incarcerated (PI) method. The PI platinum catalyst thus prepared showed high activity in hydrosilylation, and recovery and reuse of the catalyst were attained without loss of activity. Application of this catalyst to hydrogenation is also reported.
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)。
A Rh(I) complex with an annulated N-heterocyclic carbene ligand for E-selective alkyne hydrosilylation
作者:Akshi Tyagi、Suman Yadav、Prosenjit Daw、Chitrakar Ravi、Jitendra K. Bera
DOI:10.1016/j.poly.2019.04.027
日期:2019.11
A Rh(I) complex supported by a fused pi-conjugated imidazo[1,2-a][1,8]naphthyridine-based N-heterocyclic carbene ligand with a Dipp attachment on the imidazole nitrogen has been synthesized and structurally characterized. The title complex is found to be an excellent catalyst for accessing E-vinylsilanes. The scope of the chemoselective hydrosilylation is examined for a range of terminal alkynes with silanes Et3SiH and (EtO)(3)SiH. (C) 2019 Elsevier Ltd. All rights reserved.
Ruthenium-Catalyzed Hydrosilylation of 1-Alkynes with Novel Regioselectivity
[GRAPHIC]A ruthenium catalyst precursor bearing a bulky and electron-donating pentamethylcyclopentadienyl (Cp-*) ligand, typically (CpRuH3)-Ru-*(PPh3), mediates hydrosilylation of several 1-alkynes with novel regioselectivity to give preferentially 2-silyl-1-alkenes.