Kinetics and mechanism of oxygenation of aromatic sulfides and arylmercaptoacetic acids by peroxomonophosphoric acid
作者:Duraisamy Thenraja、Perumal Subramaniam、Chockalingam Srinivasan
DOI:10.1016/s0040-4020(02)00358-7
日期:2002.5
oxygenation of aryl methyl sulfides and diaryl sulfides by peroxomonophosphoric acid in acetonitrile–water mixture follows an overall second-order kinetics, first-order in each reactant. The study of the influence of [H+] on the oxidation of phenyl methyl and diphenyl sulfides reveals that H2PO5− and HPO52− are the oxidising species in the oxidation process. In substituted phenyl methyl sulfides and diphenyl
过氧一磷酸在乙腈-水混合物中对芳基甲基硫醚和二芳基硫醚的氧化遵循总体二级动力学,即每个反应物的一级动力学。[H的影响的研究+ ]上苯基甲基和二苯基硫化物的氧化揭示ħ 2 PO 5 -和HPO 5 2-是在氧化过程中的氧化物质。在取代的苯基甲基硫醚和二苯基硫醚中,给电子取代基加速了氧合速度,而吸电子基团则阻碍了氧合速度,表明硫化物硫对过氧化物氧的亲核取代。负ρ在速率常数与σ常数的相关性分析中获得的C值也表明在限速步骤中形成了带更多正电荷的硫。与不同的烷基的苯基硫化物研究(C 6 H ^ 5 SR; R =甲基,乙基,镨我或卜吨)指示该速率由笨重的R基团延迟。在苯基巯基乙酸钠的过氧单磷酸氧化中也获得了相似的动力学结果。在动力学研究的基础上,提出了一种常见的机理。