The mechanism for the oxidation of sulfides by [(me4-salen)CrV(O)(pyO)]CF3SO3, where me4-salen is 8,8,8',8'-tetramethylsalen and pyO is pyridine N-oxide, has been investigated. Results from Hammett correlations on the rates of oxidation of substituted thioanisoles, frontier molecular orbital calculations, and product studies are consistent with a mechanism that is initiated by a single electron transfer to give a radical cation intermediate.Key words: oxidation, chromium(V), sulfides, radical cation, oxygen transfer.
[(me
4-salen)Cr
V(O)(pyO)]CF
3SO
3氧化
硫化物的机制已经研究。其中me
4-salen是8,8,8',8'-四甲基萨伦,pyO是
吡啶N-氧化物。通过对取代
硫代
苯甲醚氧化速率的Hammett相关性结果、前线分子轨道计算和产物研究,得出的结论与一个由单电子转移引发的自由基阳离子中间体的机制一致。关键词:氧化、
铬(V)、
硫化物、自由基阳离子、氧转移。