Nano-rod like morphology of Ni@Fe3O4-NDCs on interaction of NDC-supported Fe3O4 with nickel NPs: An efficient catalyst for ligand free Chan-Lam coupling reaction in aqueous medium

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

“…Quite recently, Paul et al [244] described the synthesis of five different catalysts, nickel, and/or iron supported onto the magnetic nitrogen-doped carbons (NDCs), including two monometallic (Fe@Fe 3 O 4 -NDCs and Ni@Fe 3 O 4 -NDCs) and two bimetallic (Fe@Ni-Fe 3 O 4 -NDCs and Ni@Fe-Fe 3 O 4 -NDCs and one alloy (NiFe@Fe 3 O 4 -NDCs) catalyst (Figure 62). Initially, starch: silica (1:1.2) was heated at 553 K for 8 h under an N 2 atmosphere.…”

“…Product from N-arylation of amines with aryl halides (iodides and bromide) DMF, K 2 CO 3 , 100 C, 6-10 h 15%-92% 3 [225] MWCNTs/CC-SH/Pd Product from coupling of aryl halides (iodide, bromide, and chloride) with amines DMF, K 2 CO 3 , 100 C, 8 h 60%-96% 6 [226] Pd@MWCNTs Product from Buchwald-Hartwig amination MeOH/H 2 O, 110 C, 16 h 0%-9% 0 [227] GO-Chit-Pd Product from coupling of aryl halides (iodide, bromide, and chloride) with amines DMF, t-BuOK, 100 C, 12 h 40%-98% 5 [228] Pd-CN Product from coupling of aryl and pyridyl chlorides with dialkyl substituted amines NMP, CF 3 SO 3 Li, 80 C, 12 h 75%-98% 6 [229] PdNPs/BC Product from coupling of anilines with Ni@Fe 3 O 4 -NDCs Product from coupling of amines and arylboronic acids H 2 O, K 2 CO 3 , 100 C, 3-9 h Trace-89% [244] triazole-modified chitosan@nickel(0)…”

“…C H E M E 1 0 8 Fe 3 O 4 @SiO 2 -EDTA-Ni(0)-catalyzed N-arylation of (hetero)arylamines with (hetero)aryl carbamates and sulfamatesF I G U R E 6 2Preparation of metal NPs supported on magnetically modified N-doped carbons. Reprinted from Sharma et al[244] Elsevier S C H E M E 1 0 9 C-N coupling of amines and arylboronic acids catalyzed by Ni@Fe 3 O 4 -nitrogen-doped carbons (NDCs) S C H E M E 1 1 0 Amination of different amines with phenols…”

Green synthesis of shape-tunable CuFe2O4NPs: a magnetically retrievable and efficient catalyst for Chan–Lam type C–N coupling reactions under base-free conditions

“…16 To combat the recovery, and hence the reusability issues, heterogeneous catalysts are extensively used under various reaction conditions for C-N coupling reactions. [17][18][19][20][21][22][23][24] However, prolonged reaction time, high temperature, use of ligands and base, the necessity of a support for the active catalyst for better performance and the tedious synthesis procedure for the catalyst are again the most common drawbacks. These inconveniences invite researchers to develop an easy but effective protocol for the C-N coupling reactions.…”

“…Among different heterogeneous catalysts, magnetic nanocatalysts have emerged as effective catalysts because of their unique magnetic properties, lower operational costs, easy accessibility and recovery from the reaction mixture, easy recyclability and chemical stability. [18][19][20][21][24][25][26][27] In recent years, ferrite-based magnetic NPs have gained considerable attention from researchers in the field of heterogeneous catalysis over other magnetic NPs due to their low cost, low toxicity, excellent reaction output, ease of recovery for reuse without significant loss of activity, and compatibility with green chemistry aspects. 25,[28][29][30][31] Among different magnetic ferrite NPs, CuFe 2 O 4 NPs have many technological advantages due to their phase transition, high air-stability, changing semiconducting properties, tetragonality, and electrical switching variation when treated under various conditions, as well as interesting electrical and magnetic properties with thermal and chemical stabilities.…”