首次开发了负载在咪唑改性膨润土Bent @ Im @ Au NPs上的金纳米颗粒,作为一种有效的非均相催化剂,用于在温和的反应条件下于水中以0.07 mol%的Au负载量合成炔丙胺。X射线衍射,高分辨率透射电子显微镜,傅立叶变换红外光谱和通过扫描电子显微镜进行的元素作图等各种技术被用于确定催化剂的物理化学性质。发现新的金催化剂是高活性的,通过具有吸电子以及给电子取代基的各种醛与不同的胺和炔烃的反应,提供了高到极好的A3偶联产物收率。
Copper(II)-Schiff Base Complex-Functionalized Polyacrylonitrile Fiber as a Green Efficient Heterogeneous Catalyst for One-Pot Multicomponent Syntheses of 1,2,3-Triazoles and Propargylamines
作者:Pengyu Li、Yuanyuan Liu、Lu Wang、Jian Xiao、Minli Tao
DOI:10.1002/adsc.201701475
日期:2018.4.17
A series of copper(II)‐Schiff bases‐functionalized polyacrylonitrile fiber catalysts were successfully prepared using copper acetate as copper source and characterized by elemental analysis, fourier‐transfer infrared spectroscopy, ultraviolet‐visible spectroscopy, X‐ray photoelectron spectroscopy and inductively coupled plasma analysis. Excellent physical strength and thermal stability of the fiber
Discrete Benzotriazole‐Copper(II) Complexes in Chelated and Non‐Chelated Coordination Modes: Structural Analysis and Catalytic Application in Click and A
<sup>3</sup>
Coupling Reactions
作者:Sharmila Pandey、Tanmoy Mandal
DOI:10.1002/ejic.202100103
日期:2021.5.14
Two copper(II) complexes with benzotriazole‐based ligands having pyridyl and quinolinyl arms were synthesized in good yields and characterized fully via spectroscopic and crystallographic techniques. The crystalstructures of the complexes revealed different coordination environments around copper(II) centers. The difference in structure was due to the steric effect of the ligands, which resulted in
Improving the Catalytic Activity of Au<sub>25</sub>
Nanocluster by Peeling and Doping
作者:Man-bo Li、Shi-kai Tian、Zhikun Wu
DOI:10.1002/cjoc.201600526
日期:2017.5
the novel cadmium doped goldnanocluster Au26Cd5 shows high catalyticactivity, as well as good recyclability and substrate tolerance for the same reaction. The high catalyticactivity is attributed to the cooperation between the exerted cadmium atoms and the neighbor goldatoms on the surface of Au13 icosahedron. This work has important implication for the tuning of nanoclusters’ compositions and structures
调整纳米团簇的组成和结构对于提高纳米团簇的性能至关重要。在此,著名的Au 25(SCH 2 CH 2 Ph)18(简称Au 25)纳米簇已转变为稀有的掺杂镉的金纳米簇[Au 13 Cd 2(PPh 3)6(SC 2 H 4 Ph)6(NO 3)2 ] 2 Cd(NO 3)4(简称Au 26 Cd 5)通过剥离和掺杂。虽然金25在研究条件下对A 3偶联反应没有催化活性,新型镉掺杂金纳米簇Au 26 Cd 5表现出高催化活性,并且对同一反应具有良好的可回收性和底物耐受性。高催化活性归因于所施加的镉原子与Au 13二十面体表面上的相邻金原子之间的协作。这项工作对于通过一些不寻常但有效的策略来改进纳米团簇的组成和结构具有重要的意义。
Caffeine gold complex supported on magnetic nanoparticles as a green and high turnover frequency catalyst for room temperature A<sup>3</sup>
coupling reaction in water
A new heterogeneous catalyst derived from gold (III) and supported on caffeine‐coated magnetic nanoparticles, Fe3O4@Caff‐Au, has been prepared and characterized using different techniques. This magnetic gold composite shows high catalytic activity in A3 coupling reactions of terminalalkynes, aldehydes and secondary amines. Using this greencatalyst, propargylamines are obtained in high turnover frequency
制备了一种新的非均相催化剂,其由金(III)衍生并负载在咖啡因包覆的磁性纳米颗粒上,Fe 3 O 4 @ Caff-Au,并使用不同的技术进行了表征。这种磁性金复合材料在末端炔烃,醛和仲胺的A 3偶联反应中显示出高催化活性。使用这种绿色催化剂,在室温下以水为溶剂,可以在短反应时间内以高周转频率获得炔丙胺。这种稳定且易于使用的催化剂可以轻松地以磁性方式循环使用至少九次连续运行,而不会显着降低活性,并且不会产生金的轻微聚集。
Heterocyclic thiolates and phosphine ligands in copper‐catalyzed synthesis of propargylamines in water
The product obtained by reaction of deprotonation of 2‐mercaptobenzothiazole or methimazole (2‐mercapto‐1‐methylimidazole) with copper iodide in the presence of tertiary phosphines, PR2R' (R = R' = cyclohexyl; R = R' = phenyl; R = phenyl, R' = methyl) showed high catalytic activity in A3 coupling of a series of aldehydes with phenylacetylene and piperidine, yielding propargylamines. An investigation
在叔膦PR 2 R'(R = R'=环己基; R = R'=苯基)存在下,通过2-巯基苯并噻唑或甲or唑(2-巯基-1-甲基咪唑)与碘化铜的质子化反应获得的产物; R =苯基,R'=甲基)在A 3中显示出高催化活性一系列醛与苯乙炔和哌啶的偶合,产生炔丙基胺。主要通过电喷雾电离质谱(ESI-MS)技术对活性物质的性质进行的研究强调了有机硫和有机磷化合物在负责这些反应的活性物质的产生中所起的关键作用。偶联反应在水/ THF(20:1)中催化剂负载量低且反应时间较短的条件下成功进行。还用20个实施例研究了反应的范围。