Fe₃O₄@SiO₂@(CH₂)₃-urea-thiourea as a new hydrogen-bonding and retrievable nanomagnetic catalyst was fabricated and its structure confirmed by transmission electron microscopy (TEM), thermogravimetric analysis/ derivative thermogravimetric (TGA/DTG), vibrating sample magnetometer (VSM), Fourier transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FESEM), energy dispersive spectroscopy (EDS), and elemental mapping analysis. The catalytic performance of the novel hydrogen-bonding catalyst was appropriately probed through the multicomponent preparation of bipyridine-5-carbonitriles via a cooperative vinylogous anomeric based oxidation (CVABO) mechanism in the absence of any solvent. The novel hydrogen-bonding nanomagnetic catalyst can readily be regained and reused four times without appreciable destruction of catalytic efficiency.

制备了Fe ₃ O ₄ @SiO ₂ @（CH ₂）_3-脲硫脲作为新型的氢键可回收纳米磁性催化剂，并通过透射电子显微镜（TEM），热重分析/导数热重分析（TGA / DTG）证实了其结构。 ），振动样品磁力计（VSM），傅立叶变换红外（FT-IR）光谱，场发射扫描电子显微镜（FESEM），能量色散光谱（EDS）和元素图分析。新型氢键催化剂的催化性能可以通过联吡啶5-腈的多组分制备进行考察。在不存在任何溶剂的情况下，基于乙烯基异氰酸酯的协同氧化（CVABO）机理。新型氢键结合的纳米磁性催化剂可以很容易地获得并重复使用四次，而不会明显破坏催化效率。