Abstract Two magnetic nano catalysts of nickel and copper, Fe 3 O 4 @SiO 2 @DOP-BenPyr-M(II), (M=Ni and Cu) have been synthesized. These catalysts were applied as recoverable, efficient and new heterogeneous catalysts for the high yielding and room temperature one-pot procedure of selective oxidation of sulfides to sulfoxides and oxidative coupling of thiols to disulfides. In addition, the catalytic activity of Fe 3 O 4 @SiO 2 @DOP-BenPyr-Ni(II) was investigated as heterogeneous nanocatalyst for synthesis of 2,3-dihydroquinazolin-4(1H)-ones, 5-substituted 1H-tetrazoles and polyhydroquinolines. The synthesized catalysts were characterized by FT-IR, TGA, XRD, VSM, EDX, ICP and SEM techniques. These catalysts were recovered by an external magnet and reused several times without significant loss of catalytic efficiency. Graphic Abstract

中文翻译：

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磁性功能化镍和铜纳米催化剂的合成和表征及其在氧化、氧化偶联和各种多组分反应中的应用

摘要 合成了镍和铜的两种磁性纳米催化剂Fe 3 O 4 @SiO 2 @DOP-BenPyr-M(II), (M=Ni and Cu)。这些催化剂被用作可回收、高效和新型多相催化剂，用于硫化物选择性氧化成亚砜和硫醇氧化偶联成二硫化物的高产率和室温一锅法。此外，研究了 Fe 3 O 4 @SiO 2 @DOP-BenPyr-Ni(II) 作为多相纳米催化剂的催化活性，用于合成 2,3-二氢喹唑啉-4(1H)-酮、5-取代的 1H-四唑和聚氢喹啉。通过FT-IR、TGA、XRD、VSM、EDX、ICP和SEM技术对合成的催化剂进行了表征。这些催化剂通过外部磁铁回收并重复使用多次，催化效率没有显着损失。图形摘要