Regioselective Ortho‐C H sulfenylation of free phenols catalyzed by Co(II)-immobilized on silica-coated magnetic nanoparticles
作者:Sepideh Khaef、Abed Rostami、Vahid Khakyzadeh、Mohammad Ali Zolfigol、Avat Arman Taherpour、Meysam Yarie
DOI:10.1016/j.mcat.2020.110772
日期:2020.3
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
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。