New tetradentate N,N,N,N-chelating α-diimine ligands and their corresponding zinc and nickel complexes: synthesis, characterisation and testing as olefin polymerisation catalysts
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.
Azide-Alkyne Cycloaddition (CuAAC) in Alkane Solvents Catalyzed by Fluorinated NHC Copper(I) Complex
作者:Maxim A. Topchiy、Alexandra A. Ageshina、Pavel S. Gribanov、Salekh M. Masoud、Timur R. Akmalov、Sergey E. Nefedov、Sergey N. Osipov、Mikhail S. Nechaev、Andrey F. Asachenko
DOI:10.1002/ejoc.201801538
日期:2019.2.7
A highly efficient and environmentallybenign protocol for copper‐catalyzed alkyne–azide cycloaddition (CuAAC) in industrially important alkane solvents was developed. New (NHCF)CuI complex decorated with bulky group [(CF3)2(OiAm)C–] exhibited the best catalytic activity in the reactions of diversely substituted alkyne and azide substrates in alkane solvents.
针对工业上重要的烷烃溶剂中的铜催化的炔-叠氮化物环加成(CuAAC),开发了一种高效且对环境无害的方案。新的(NHC F)Cu I络合物装饰有大体积基团[(CF 3)2(O i Am)C–]在烷烃溶剂中不同取代的炔烃和叠氮化物底物的反应中表现出最佳的催化活性。
The copper–nicotinamide complex: sustainable applications in coupling and cycloaddition reactions
作者:R. B. Nasir Baig、Buchi Reddy Vaddula、Mallikarjuna N. Nadagouda、Rajender S. Varma
DOI:10.1039/c4gc02047b
日期:——
The copper(ii)–nicotinamide complex catalyzes the C–S, C–N bond forming and cycloaddition reactions under a variety of sustainable reaction conditions.
铜(II)-烟酰胺配合物在各种可持续反应条件下催化C-S、C-N键形成和环加成反应。
A straightforward and sustainable synthesis of 1,4-disubstituted 1,2,3-triazoles via visible-light-promoted copper-catalyzed azide–alkyne cycloaddition (CuAAC)
作者:Willber D. Castro-Godoy、Adrián A. Heredia、Luciana C. Schmidt、Juan E. Argüello
DOI:10.1039/c7ra06390c
日期:——
A simple and green synthesis of 1,4-disubstituted1,2,3-triazoles through the effective reduction of copper(II) assisted by organic dyes and promoted by visible light was developed. This reaction was performed under very mild conditions, using water as solvent, under a non-inert atmosphere, with low catalyst precursor loading, and in the absence of any additive. Copper and solvent recycling was successfully
A highly active magnetically recoverable nano ferrite-glutathione-copper (nano-FGT-Cu) catalyst for Huisgen 1,3-dipolar cycloadditions
作者:R. B. Nasir Baig、Rajender S. Varma
DOI:10.1039/c2gc16301b
日期:——
1,2,3-Triazoles were synthesized in water using magnetically recoverable heterogeneous Cu catalyst via one-pot multi component reaction using MW irradiation. Aqueous reaction medium, easy recovery of the catalyst using an external magnet, efficient recycling, and the high stability of the catalyst renders the protocol economic and sustainable.