NNN-pincer-copper complex immobilized on magnetic nanoparticles as a powerful hybrid catalyst for aerobic oxidative coupling and cycloaddition reactions in water
作者:Nasrin Zohreh、Mahboobeh Jahani
DOI:10.1016/j.molcata.2016.11.007
日期:2017.1
such as SEM, TEM, FT-IR, TGA, ICP, XRD, and elemental analysis. The finely engineered supported catalyst is employed in the aerobic oxidative coupling of terminalalkynes and click reaction using only 0.38 and 0.04 mol% catalyst, respectively. All reactions perform under solvent-free condition or green solvent H 2 O. Also, the catalyst is readily recovered and reused for up to 8 and 6 subsequent runs
摘要 描述了一种简单可靠的方法,用于制备第一个对表面组成具有高度控制的非均相 NNN-钳形铜杂化催化剂。该策略依赖于 2-氨基吡啶与三聚氯氰功能化磁性纳米粒子的共价键合,然后与 CuI 络合。这些声明通过不同的表征方法得到证实,例如 SEM、TEM、FT-IR、TGA、ICP、XRD 和元素分析。精细设计的负载型催化剂用于末端炔烃的有氧氧化偶联和点击反应,分别仅使用 0.38 和 0.04 mol% 的催化剂。所有反应均在无溶剂条件或绿色溶剂 H 2 O 下进行。此外,
Magnetic starch nanocomposite as a green heterogeneous support for immobilization of large amounts of copper ions: heterogeneous catalyst for click synthesis of 1,2,3-triazoles
new magnetic heterogeneous copper catalyst was prepared by immobilization of copper ions onto a cross-linked polymeric nanocomposite composed of starch grafted polyacrylamide and functionalized Fe3O4 magnetic nanoparticles. The resulting support was loaded with large amounts of copper ions (1.6 mmol g−1). The prepared catalyst is highly active in Huisgen 1,3-dipolar cycloadditionreactions of different
通过将铜离子固定在由淀粉接枝的聚丙烯酰胺和功能化的Fe 3 O 4磁性纳米粒子组成的交联聚合物纳米复合材料上,制备了一种新型的磁性异质铜催化剂。所得的载体上载有大量的铜离子(1.6mmol g -1)。所制备的催化剂在低催化剂量下对不同叠氮化物和炔烃的Huisgen 1,3-偶极环加成反应具有很高的活性。在温和的条件下以高收率生产了各种相应的1,2,3-三唑。该催化剂易于回收并再用于十个反应循环,没有观察到明显的催化活性损失。
Graphene oxide/poly(vinyl imidazole) nanocomposite: an effective support for preparation of highly loaded heterogeneous copper catalyst
heterogeneous polymeric catalyst was synthesized by immobilization of copper ions in a graphene oxide/poly(vinyl imidazole) nanocomposite. This catalyst has proven to be highly active in a practical protocol for click synthesis of 1,2,3‐triazole via one‐pot three‐component cycloaddition of halides, terminalalkynes and sodiumazide. The reaction was carried out in water medium and good to excellent yields