The immobilized copper species on nickel ferrite (NiFe2O4@Cu): a magnetically reusable nanocatalyst for one-pot and quick reductive acetylation of nitroarenes to N-arylacetamides
作者:Behzad Zeynizadeh、Zahra Shokri、Iman Mohammadzadeh
DOI:10.1007/s13738-019-01818-9
日期:2020.4
In this study, a green protocol for synthesis of N-arylacetamides was introduced. Magnetically, nanoparticles of the immobilized copper species on nickel ferrite, NiFe2O4@Cu, were synthesized and then characterized using SEM, EDX, XRD, VSM, ICP-OES, BET and XPS analyses. The XPS analysis approved that the immobilized copper species on NiFe2O4 only contain Cu(0) and its oxide form as CuO. The prepared nanocomposite system represented a perfect catalytic activity toward one-pot and quick reductive acetylation of various nitroarenes to the corresponding N-arylacetamides. All reactions were carried out in a mixture of H2O–EtOH (1.5–0.5) within 2–10 min using the combination system of NaBH4 and Ac2O in a one-pot approach and via a two-step procedure. The utilized Cu nanocomposite was magnetically separated from the reaction mixture and reused for 5 consecutive cycles without the significant loss of its catalytic activity.
在本研究中,介绍了一种合成N-芳基乙酰胺的绿色方法。采用磁性方式合成了固定化铜物种的镍铁氧体纳米粒子(NiFe2O4@Cu),使用SEM、EDX、XRD、VSM、ICP-OES、BET和XPS分析进行了表征。XPS分析证实,固定在NiFe2O4上的铜物种仅包含Cu(0)及其氧化形式CuO。所制备的纳米复合体系对一系列硝基芳烃的一锅快还原乙酰化反应表现出极佳的催化活性,能够高效合成了对应的N-芳基乙酰胺。所有反应均在H2O-EtOH(1.5-0.5)混合溶剂中进行,采用NaBH4和Ac2O的组合体系,一锅法通过两步程序,在2-10分钟内完成。所使用的铜纳米复合物通过磁性分离从反应混合物中回收并连续重复使用5次,催化活性无明显损失。