Magnetically recoverable copper nanorods and their catalytic activity in Ullmann cross‐coupling reaction

Abstract

A novel polydentate ligand supported on Fe 3 O 4 @SiO 2 was designed and demonstrated for the synthesis of Cu nanorods. The Fe 3 O 4 @SiO 2 /EP.EN.EG@Cu was characterized using X-ray diffraction, thermogravimetric analysis, transmission electron microscopy, energy-dispersive X-ray spectroscopy and vibrating sample magnetometry. The Fe 3 O 4 @SiO 2 /EP.EN.EG@Cu showed excellent catalytic efficiency for the cross-coupling reaction of nitrogen-containing heterocycles with aryl halides. The catalyst could be effectively separated from the reaction mixture by simply applying an external magnetic field and reused at least five times without loss of activity.

Fe3O4@SiO2/EP.EN.EG.Cu as a Highly Efficient and Recoverable Catalytic System for Synthesis of 1,4‐Disubstituted 1,2,3‐Triazole Derivatives via the Click Reaction

“…From our previous study, we found that successfully synthesized Fe 3 O 4 @SiO 2 /EP.EN.EG.Cu can be used as a highly efficient robust in the reduction of nitro compounds and Ullmann cross‐coupling reaction under mild conditions. This results encouraged the authors to study catalytic efficiency in other reaction, herein we report a simple and efficient methodology for the synthesis of 1,4‐disubstituted‐1,2,3‐triazole.…”

Recent advances in the application of nanocatalysts in C‐N coupling reactions

“…Preparation of Fe 3 O 4 @SiO 2 /EP.EN.EG@Cu. Reprinted with permission from Rajabzadeh et al [ 149 ] Copyright 2017 John Wiley and Sons…”

“…EN.EG@Cu. Reprinted with permission from Rajabzadeh et al [149] Copyright 2017 John Wiley and Sons S C H E M E 1 9 N-arylation of different nitrogen-containing heterocycles with aryl halides catalyzed by Fe 3 O 4 @SiO 2 /EP.EN.EG@Cu S C H E M E 2 0 N-arylation of imidazole with different aryl halides using Fe-CuO S C H E M E 2 1 N-arylation of different heterocycles with 4-bromobenzonitrile using Fe-CuO T A B L E 6 Fe 3 O 4 @SiO 2 -DAQ-Cu (II)-catalyzed N-arylation of N(H)-heterocycles and amines with various aryl halides F I G U R E 6 Preparation of the maghemite-Cu nanocatalyst. Reprinted with permission from Sharma et al [152] Copyright 2015 John Wiley and Sons F I G U R E 7 Preparation of Cu/ascorbic acid@MNPs.…”

L‐lysine‐Pd Complex Supported on Fe3O4MNPs: a novel recoverable magnetic nanocatalyst for Suzuki C‐C Cross‐Coupling reaction

“…[ 1–7 ] Industry favors the application of heterogeneous catalysts over homogeneous processes in view of the ease of handling and simple work‐up and separations. [ 8–15 ] Because of the importance of environmental and economic issues, global scientific and industrial discoveries in the field of catalysts should use the principles of “Green Chemistry”. [ 16–23 ] Recovery and reusability which can be regarded as the two valuable keys attached to the catalytic reactions for the definition of sustainability indicate that a catalytic process follows the “Green Chemistry” principles.…”