A new strategy for catalytic functionalization of C-H bonds by means of electrochemical oxidation is described. Combination of palladium-catalyzed aromatic C-H bond cleavage and halogenation with electrochemically generated halonium ions enables highly efficient, selective halogenations of aromatic compounds in a green-sustainable manner. The required reagents for this reaction are an arene and an
copper-catalyzed C-H halogenation of 2-aryl-pyridinescontaining a variety of electron-withdrawing and electron-donatingsubstituents was described. It is worth noting that cheap and easy-to-handlelithium halides were utilized as the halogen sources.
Investigating the mechanism of Ni-mediated trifluoromethylthiolation of aryl halides using AgSCF<sub>3</sub>
作者:Weiling Chiu、Ben E. Nadeau、Brian O. Patrick、Jennifer A. Love
DOI:10.1039/d2dt03758k
日期:——
mechanism of the Ni-catalysed trifluoromethylthiolation of aryl chlorides using AgSCF3 is studied herein. A variety of IPr NiII complexes were synthesized via oxidative addition of Ni0 to 2-(2-chloro)phenylpyridines. Their reactivity with AgSCF3 was tested by performing stoichiometric experiments, cyclic voltammetry, and NMR spectroscopic studies. CuSCF3 was shown to behave similarly to AgSCF3, while reactions
本文研究了使用 AgSCF 3 的镍催化芳基氯三氟甲基硫醇化反应的机理。通过将Ni 0氧化加成到 2-(2-氯) 苯基吡啶,合成了多种 IPr Ni II配合物。它们与 AgSCF 3的反应性通过化学计量实验、循环伏安法和核磁共振光谱研究进行了测试。CuSCF 3显示出与 AgSCF 3类似的行为,而与 NMe 4 SCF 3的反应揭示了形成氟化镍络合物的主要化学计量副反应。NMR 动力学研究表明,苯基或吡啶基上的对位取代基的吸电子/供电子性质与相应产物的形成之间几乎没有相关性。循环伏安法 (CV) 表明 Ni I /Ni III跃迁的可行性,并且随着溶剂极性的增加观察到产物形成速率增加。证据表明,该机制通过从 AgSCF 3到 Ni II的内球电子转移 (ET)进行,最终导致三氟甲基硫醇化产物的形成。