Fe₃O₄@SiO₂[email protected]^II is prepared by the silica-coated magnetic nanoparticles, urea-triazole, and CoCl₂. This organic-inorganic hybride composite showed a good to excellent catalytic activity toward regioselective ortho-sulfenylation of free phenols and naphthols using pivalic anhydride as a directing group, also K₂S₂O₈ and PPh₃ were employed as oxidant and additive respectively. The newly synthesized catalyst was fully characterized by using different techniques such as FT-IR, TGA, DTG, TEM, SEM, EDS, ICP and VSM analyses. The competitive price, accessibility and lower toxicity of cobalt compared to expensive transition metals using for CH bond activation and functionalization constitute precious advantages for this method. Moreover, this heterogeneous catalyst could be magnetically recovered and reused without significant loss of its catalytic activity after five cycles.

Fe ₃ O ₄ @SiO ₂ [电子邮件保护] ^II是通过二氧化硅包覆的磁性纳米颗粒，脲三唑和CoCl ₂制备的。这种有机-无机杂化复合物，使用新戊酸酐，K ₂ S ₂ O ₈和PPh ₃作为导向基团，对游离酚和萘的区域选择性邻亚磺酰化表现出良好至优异的催化活性。分别用作氧化剂和添加剂。通过使用不同的技术（例如FT-IR，TGA，DTG，TEM，SEM，EDS，ICP和VSM分析）对新合成的催化剂进行了全面表征。与用于C H键活化和官能化的昂贵过渡金属相比，钴具有竞争力的价格，可及性和较低的毒性构成了该方法的宝贵优势。而且，这种多相催化剂可以在五个循环后被磁回收和再利用而不会显着损失其催化活性。