Efficient reduction of nitro compounds and domino preparation of 1-substituted-1<i>H</i>-1,2,3,4-tetrazoles by Pd(<scp>ii</scp>)-polysalophen coated magnetite NPs as a robust versatile nanocomposite
作者:DaPeng Xu、Meilu Xiong、Milad Kazemnejadi
DOI:10.1039/d1ra01164b
日期:——
A new, versatile, and green methodology has been developed for the efficient NaBH4-reduction of nitroarenes as well as the domino/reduction MCR preparation of 1-substituted-1H-1,2,3,4-tetrazoles using Pd(II)-polysalophen coated magnetite NPs as an efficient heterogeneous magnetically recyclable nanocatalyst. Polysalophen was firstly prepared based on a triazine framework with a high degree of polymerization
开发了一种新的、通用的、绿色的方法,用于有效的 NaBH 4还原硝基芳烃以及使用 Pd( II)的多米诺/还原 MCR 制备 1-取代-1 H -1,2,3,4-四唑)-聚salophen涂覆的磁铁矿纳米颗粒作为一种高效的非均相磁性可回收纳米催化剂。首先以高聚合度的三嗪骨架为基础制备了聚salophen,然后与Pd离子配位,最后将所得杂化物固定在磁铁矿纳米粒子上。通过各种仪器和分析方法对催化剂进行了表征,包括GPC、DLS、N 2吸附-解吸、TGA、VSM、TEM、HRTEM、EDX、XPS、XRD 和ICP 分析。该催化剂具有双重功能,包括通过多米诺骨牌协议一步完成硝基芳烃的还原和四唑环的构建。硝基还原和由硝基化合物直接制备 1-取代-1 H -1,2,3,4-四唑均获得了高至优异的产率。通过原位XPS 和原位DLS 以及多个对照实验深入了解了该机制。对催化剂的可回收性进行了 6 个连续