Electron Transfer Mechanism in the Oxidation of Aryl 1-Methyl-1-phenylethyl Sulfides Promoted by Nonheme Iron(IV)–Oxo Complexes: The Rate of the Oxygen Rebound Process
作者:Alessia Barbieri、Tiziana Del Giacco、Stefano Di Stefano、Osvaldo Lanzalunga、Andrea Lapi、Marco Mazzonna、Giorgio Olivo
DOI:10.1021/acs.joc.6b02434
日期:2016.12.16
The oxidation of aryl 1-methyl-1-phenylethyl sulfides promoted by the nonheme iron(IV)–oxo complexes [(N4Py)FeIV═O]2+ and [(Bn-TPEN)FeIV═O]2+ occurs by an electron transfer–oxygen rebound (ET–OT) mechanism leading to aryl 1-methyl-1-phenylethyl sulfoxides accompanied by products derived from Cα–S fragmentation of sulfide radical cations (2-phenyl-2-propanol and diaryl disulfides). For the first time
芳基1-甲基-1-苯乙基硫化物的由非血红素铁促进氧化(IV) -氧代配合物[(N4Py)的Fe IV = O] 2+和[(BN-TPEN)的Fe IV = O] 2+发生由电子转移-氧反弹(ET-OT)机理,导致芳基1-甲基-1-苯基乙基亚砜与硫化物自由基阳离子的Cα-S片段化衍生的产物(2-苯基-2-丙醇和二芳基二硫化物)伴随产生。氧回弹过程的速率常数(k OT)首次从自由基阳离子的裂解速率常数(<0.8×10 4到3.5×10 4 s –1)确定。k f)和S氧化/碎片产物的比率。
The mechanism of enzymatic and biomimetic oxidations of aromatic sulfides and sulfoxides
Biomimetic and enzymaticoxidations of benzyl sulfides and sulfoxides lead to products (sulfoxides or sulfones) different from those obtained with bona fide electron transfer oxidations (products of CH and/or CS bond cleavage), which suggests the operation of an oxygen transfer mechanism.