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。
Co(II)-catalyzed regioselective clean and smooth synthesis of 2-(aryl/alkyl-thio)phenols via sp2 C H bond activation
作者:Abed Rostami、Vahid Khakyzadeh、Mohammad Ali Zolfigol、Amin Rostami
DOI:10.1016/j.mcat.2018.04.020
日期:2018.6
The first example of a smooth, practical and useful strategy for the preparation of ortho-aryl/alkyl sulfenyl phenols by using the reaction of aryl/alkyl thiols with phenols in the presence cobalt as catalyst, and with the assistance of acetic anhydride as directing group via CH bond activation, was developed. Described method enables to form selectively CS bond without any ligand, oxidant, and aryl/alkyl
Direct sulfenylation and selenylation of phenols using a stoichiometric amount of FeCl3 under an oxygen atmosphere has been developed. The chalcogenated phenols were shown to be suitable for preparing S- and Se-containing compounds using the reaction of the remaining hydroxy group.
Disulfide-Directed C-H Hydroxylation for Synthesis of Sulfonyl Diphenyl Sulfides and 2-(Phenylthio)phenols with Oxygen as Oxidant
作者:Long Wang、Yi-Bi Xie、Nian-Yu Huang、Nuo-Nuo Zhang、De-Jiang Li、Yu-Lin Hu、Ming-Guo Liu、Dong-Sheng Li
DOI:10.1002/adsc.201600861
日期:2017.3.6
sulfur). Here, the disulfide‐directed C–H activation for thew synthesis of sulfonyl diphenyl sulfides was realized for the first time by a copper‐catalyzed, tandem, one‐step C–S coupling/hydroxylation of disulfides and arylboronic acids with oxygen as the oxidant. This method provides a mild and easy method for the synthesis of sulfonyl diphenyl sulfides and 2‐(phenylthio)phenol derivatives and avoids producing
Metal–organic frameworks of Cu2(TPTC)-catalyzed cascade C–S coupling/Csp2–H hydroxylation reaction
作者:An-Qi Tian、Shan Liu、Zhi-Lin Ren、Long Wang、Dong-Sheng Li
DOI:10.1007/s13738-020-01860-y
日期:2020.6
disulfide-directed Csp2–H hydroxylation cascade reaction strategy catalyzed by Cu2(TPTC), a metal–organic framework material with binuclear Cu(II) paddlewheel nodes. In the strategy, Cu2(TPTC) MOF can effectively catalyze the coupling reaction of disulfide and arylboronicacid, and realize the disulfide-directed Csp2–H hydroxylation reaction. This reaction proceeded well under Cu2(TPTC) MOF catalyst with good yields