N-Heterocyclic Carbene-Protected Ag Nanoparticles Immobilized on Polyacrylonitrile Fiber as Efficient Catalysts for a Three-Component Coupling Reaction
作者:Jian Cao、Hongqi Tian
DOI:10.1002/asia.201800154
日期:2018.6.18
report the preparation and characterization of N‐heterocyclic carbene (NHC)‐stabilized silver NPs supported on polyacrylonitrile fiber (PANF). As a result, Ag loadings of up to 8 % and particle sizes of 11.0±3.2 nm were achieved. This novel nanocomposite catalyst demonstrated high activity in addition to excellent stability and reusability in the three‐component reaction between alkynes, haloalkanes
金属纳米颗粒(NPs)通常通过引入封端剂或其在载体上的分布来稳定。在此背景下,我们报告了聚丙烯腈纤维(PANF)上负载的N杂环卡宾(NHC)稳定的银NP的制备和表征。结果,实现了高达8%的Ag负载和11.0±3.2nm的粒径。除了在炔烃,卤代烷烃和胺的三组分反应中具有出色的稳定性和可重复使用性之外,这种新型的纳米复合催化剂还具有很高的活性。在该系统中,通过支持作用和配体作用使AgNP稳定。独特的NHC保护的AgNP结构和PANF支持在C sp的去质子化中发挥协同作用-H键,周转数高达3500。该催化剂成功地循环使用了八次,活性没有明显损失,并且AgNPs没有明显的聚集。此外,使用PANF-NHC @ Ag作为催化剂的流动系统的实施可产生57 mmol h -1的有效生产率。
Highly Stereoselective Semihydrogenation of Alkynes Promoted by Nickel(0) Nanoparticles
作者:Francisco Alonso、Iñaki Osante、Miguel Yus
DOI:10.1002/adsc.200505327
日期:2006.2
A new method for the highlystereoselective cis-semihydrogenation of internal alkynes is described based on in situ generated Ni(0) nanoparticles and molecular hydrogen. This reduction system also allows the semihydrogenation of terminal alkynes.
efficient suppression of overhydrogenation of alkenes by the Pd NPs. This complementary action of core-Pd and shell-Ag provides high chemoselectivity toward a wide range of alkenes with high Z-selectivity undermildreactionconditions (room temperature and 1 atm H2). Moreover, [email protected] can be easily separated from the reaction mixture and is reusable without loss of catalytic activity or
我们设计了用于钯的高选择性半氢化的核-钯/壳-银纳米复合催化剂([受电子邮件保护])。核-壳纳米复合材料的构建可以显着改善Ag NPs对炔烃的选择性半氢化反应的低活性,因为氢以协同方式从核-Pd NPs供给到壳-Ag NPs。同时,用壳-Ag NPs包被核心-Pd NPs可以有效抑制Pd NPs对烯烃的过度氢化。在温和的反应条件(室温和1 atm H 2)下,核-钯和壳-银的这种互补作用提供了对具有高Z选择性的各种烯烃的高化学选择性。)。而且,[电子邮件保护的]可以容易地从反应混合物中分离出来并且可以重复使用而不会损失催化活性或选择性。
COURTOIS, G.;MIGINIAC, P., BULL. SOC. CHIM. FRANCE, 1983, N 1-2, 21-27
作者:COURTOIS, G.、MIGINIAC, P.
DOI:——
日期:——
Highly selective hydrogenation of multiple carbon–carbon bonds promoted by nickel(0) nanoparticles
作者:Francisco Alonso、Iñaki Osante、Miguel Yus
DOI:10.1016/j.tet.2006.10.043
日期:2007.1
A new method for the highlystereoselective cis semihydrogenation of internal alkynes, semihydrogenation of terminal alkynes, reduction of dienes to alkenes, and reduction of alkynes and alkenes to alkanes is described based on in situ generated both Ni(0) nanoparticles and molecular hydrogen.