Abstract In recent years, there is a high demand on utilizing heterogeneous nanocatalysts in organic synthetic routes because of their green approach, facile purification of the products, and reusability of the catalyst. Herein, we introduced trihydrazinotriazine (THDT)-coated Fe3O4@SiO2 as a novel amino-functionalized magnetic nanocompostie. We fully characterized the nanocatalyst and proved the morphology and magnetic property of the nanoparticles by using essential analyses. The basic attribute of the amino-rich porous surface of the nanocomposite provides a desirable environment for enhancing various reaction conditions. To examine the applicability of the nanocatalyst in organic reactions, we synthesized several benzoxanthenes using Fe3O4@SiO2-THDT nanocatalysts. The nanocomposite successfully improved the reaction conditions and provided the benzoxanthenes in an environmentally friendly procedure, which afforded product in excellent yields (80–96%) and reduced time. The nanomagnetic catalyst was easily recovered after each trial by using an external magnet. After six successive runs, the loss of catalytic activity of the nanocomposite was negligible. Finally, we propounded a plausible mechanism for the preparation of the benzoxanthenes derivatives using the THDT-functionalized core-shell magnetic nanocatalyst.

中文翻译：

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制备三肼基三嗪官能化核壳纳米催化剂作为合成苯并氧杂蒽的极其有效的催化剂

摘要 近年来，多相纳米催化剂因其绿色环保、产物提纯容易、催化剂可重复使用等优点，在有机合成路线中得到了广泛应用。在此，我们引入了三肼基三嗪 (THDT) 涂层的 Fe3O4@SiO2 作为一种新型的氨基功能化磁性纳米复合材料。我们充分表征了纳米催化剂，并通过基本分析证明了纳米粒子的形态和磁性。纳米复合材料富含氨基的多孔表面的基本属性为增强各种反应条件提供了理想的环境。为了检查纳米催化剂在有机反应中的适用性，我们使用 Fe3O4@SiO2-THDT 纳米催化剂合成了几种苯并氧杂蒽。纳米复合材料成功地改善了反应条件，并以环保的方式提供了苯并氧杂蒽，从而以优异的产率（80-96%）提供了产品，并缩短了时间。通过使用外部磁铁，每次试验后都可以轻松回收纳米磁性催化剂。在连续运行六次后，纳米复合材料的催化活性损失可以忽略不计。最后，我们提出了一种使用 THDT 功能化核壳磁性纳米催化剂制备苯并氧杂蒽衍生物的合理机制。纳米复合材料的催化活性损失可以忽略不计。最后，我们提出了一种使用 THDT 功能化核壳磁性纳米催化剂制备苯并氧杂蒽衍生物的合理机制。纳米复合材料的催化活性损失可以忽略不计。最后，我们提出了一种使用 THDT 功能化核壳磁性纳米催化剂制备苯并氧杂蒽衍生物的合理机制。