Oxyhalogen–Sulfur Chemistry: Kinetics and Mechanism of Oxidation of Chemoprotectant, Sodium 2-Mercaptoethanesulfonate, MESNA, by Acidic Bromate and Aqueous Bromine
作者:Risikat Ajibola Adigun、Morgen Mhike、Wilbes Mbiya、Sreekanth B. Jonnalagadda、Reuben H. Simoyi
DOI:10.1021/jp411790v
日期:2014.3.27
consecutive 2-electron transfers on the sulfur center to obtain the product 1,2-ethanedisulfonic acid, a well-known medium for the delivery of psychotic drugs. Thiyl radicals were detected but the absence of autocatalytic kinetics indicated that the radical pathway was a minor oxidation route. ESI–MS data showed that the S-oxide, contrary to known behavior of organosulfur compounds, is much more stable
研究了在酸性介质中酸性溴酸盐和含水溴对抗癌疗法中众所周知的化学保护剂2-巯基乙磺酸钠(MESNA)的氧化作用。该反应的化学计量学为:的BrO 3 - + HSCH 2 CH 2 SO 3 H ^→溴- + HO 3 SCH 2 CH 2 SO 3 H.在过量的溴酸盐的条件的化学计量被推断为:6BrO 3 - + 5HSCH 2 CH 2 SO 3 H + 6H + → 3Br 2 + 5HO 3 SCH 2 CH2 SO 3 H + 3H 2 O.溴和MESNA的直接反应得到的3的化学计量比:1:3BR 2 + HSCH 2 CH 2 SO 3 H + 3H 2 O→HO 3 SCH 2 CH 2 SO 3 H + 6Br – + 6H +。这种直接反应非常快。在停止流分光光度计的混合时间范围内且双分子速率常数为1.95±0.05×10 4 M –1 s –1。尽管使用了强氧化剂,但C-S