Organic synthesis via magnetic attraction: benign and sustainable protocols using magnetic nanoferrites
作者:R. B. Nasir Baig、Rajender S. Varma
DOI:10.1039/c2gc36455g
日期:——
Magnetic nano-catalysts have been prepared using simple modification of iron ferrites. The nm size range of these particles facilitates the catalysis process, as an increased surface area is available for the reaction; the easy separation of the catalysts by an external magnet and their recovery and reuse are additional beneficial attributes. Glutathione bearing nano-ferrites have been used as organocatalysts for the Paal–Knorr reaction and homocoupling of boronic acids. Nanoferrites, post-synthetically modified by ligands, were used to immobilize nanometals (Cu, Pd, Ru, etc.) which enabled the development of efficient, sustainable and green procedures for azide–alkynes-cycloaddition (AAC) reactions, C–S coupling, O-allylation of phenol, Heck-type reactions and hydration of nitriles.
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
Anchoring Cu nanoparticles on functionalized multi‐walled carbon nanotube for regioselective synthesis of 1,2,3‐triazoles via click reaction
作者:Mahsa Khoshnevis、Hossein Eshghi
DOI:10.1002/aoc.6281
日期:2021.8
design and synthesis of a novel heterogeneous nanocatalyst (Cu@Arg-MWCNTs) with simple synthesis, immense power, high regioselectivity, and easy separation and recyclability. The Cu@Arg-MWCNT structure is characterized by different analyses and used for the synthesis of various triazoles. Its high catalytic activity is confirmed by high yields and short reaction times under mild conditions in click reaction
convenient and mild route for the one-pot syntheses of N-aryl- and N-alkyltriazoles in water is reported. The methodology involves the three-component reaction comprising phenylacetylene, sodiumazide and aryl/alkyl halide catalyzed by Cu(I) species generated in situ by a redox reaction between FeCl 3 and copper metal. Prominent features of our methodology are in-corporation of aryl fluoride to generate
A new amido-phosphane as ligand for copper and silver complexes. Synthesis, characterization and catalytic application for azide–alkyne cycloaddition in glycerol
作者:Abdallah G. Mahmoud、M. Fátima C. Guedes da Silva、Armando J. L. Pombeiro
DOI:10.1039/d1dt00992c
日期:——
it a very versatile ligand that could be used in a variety of reaction systems. To assess the coordination characteristics of the new phosphane, seven copper complexes of formulas [Cu(DBPTA)4]BF4 (2), [CuX(DBPTA)3] X = Br (3) and I (4)}, [Cu(μ-X)(DBPTA)2]2 X = Br (5) and I (6)}, [Cu(bpy)(DBPTA)2]Y Y = BF4 (7) and BPh4 (8)} bpy = 2,2′-bipyridine}, and three silver complexes with formulas [Ag(DBPTA)4]NO3
新的位阻酰胺基膦1,3,7-三氮杂-5-磷杂双环[3.3.1]壬烷-3,7-二基双(苯甲酮)DBPTA(1)是通过开笼双N-获得的。使用苯甲酸酐酰化1,3,5-triaza-7-phosphadamantane(PTA)。DBPTA是PTA唯一包含芳族附件的酰基衍生物。由于苯甲酰基C(O)Ph基团的大体积性质,它们表现出互为反构型,如溶液NMR和单晶X射线衍射所证实的。化合物1易溶于常见的极性有机和绿色溶剂,使其成为一种用途广泛的配体,可用于各种反应系统。为了评估新膦的配位特性,需要七个式[Cu(DBPTA)4 ] BF 4(2),[CuX(DBPTA)3 ] X = Br(3)和I(4)},[ Cu(μ-X)(DBPTA)2 ] 2 X = Br(5)和I(6)},[Cu(bpy)(DBPTA)2 ] Y Y = BF 4(7)和BPh 4(8}} bpy = 2,2'-bipy