Selective functionalization of C(sp<sup>3</sup>)–H bonds: catalytic chlorination and bromination by Iron<sup>III</sup>-acacen-halide under ambient condition
作者:Chang Shen、Wasihun Menberu Dagnaw、Ching Wai Fong、Kai Chung Lau、Cheuk-Fai Chow
DOI:10.1039/d2cc02924c
日期:——
The oxidative catalytic halogenations of the C(sp3)–H bond of alkanes promoted by FeIII(acacen)Cl (1III-Cl) and FeIII(acacen)Br (1III-Br) in the presence of trifluoroacetic acid (TFA) were investigated. Four major steps were involved: (i) formation of [FeV(acacen)(oxo)X] species (X = Cl or Br), (ii) hydrogen-atom transfer, (iii) halogen atom rebound, and (iv) regeneration of 1III-Cl or 1III-Br. TFA
Fe III (acacen)Cl ( 1 III -Cl ) 和 Fe III (acacen)Br ( 1 III -Br ) 在三氟乙酸存在下促进烷烃 C(sp 3 )-H 键的氧化催化卤化( TFA) 进行了调查。涉及四个主要步骤:(i) [Fe V (acacen)(oxo)X] 物质的形成(X = Cl 或 Br),(ii) 氢原子转移,(iii) 卤素原子反弹,和 (iv) 1 III -Cl或1 III -Br的再生。TFA 在 (i) 形成高价铁氧中间体和 (ii) 产生反应选择性方面发挥了重要作用。