One-Electron Reduction of Methanesulfonyl Chloride. The Fate of MeSO<sub>2</sub>Cl<sup>•</sup><sup>-</sup> and MeSO<sub>2</sub><sup>•</sup> Intermediates in Oxygenated Solutions and Their Role in the Cis−Trans Isomerization of Mono-unsaturated Fatty Acids
作者:Maurizio Tamba、Katalin Dajka、Carla Ferreri、Klaus-Dieter Asmus、Chryssostomos Chatgilialoglu
DOI:10.1021/ja070626q
日期:2007.7.1
)(-)) = -155 mV, the redox potential of the sulfonyl chloride couple, E degrees (MeSO2Cl/MeSO2Cl(.)(-)), thus results between being equal to -355 and -414 mV (vs NHE). MeSO2Cl(.)(-) reduces (besides O2) 4-nitroacetophenone. The underlying electron transfer took place with k = 1.5 x 10(9) M(-1) s(-1), corroborating an E degrees for the sulfonyl chloride couple significantly exceeding the above listed lower
甲磺酰氯 (MeSO2Cl) 的单电子还原首先导致电子加合物 MeSO2Cl(.)(-),其寿命足以直接检测并衰变成磺酰基自由基 MeSO2(.) 和 Cl(-) , k = 1.5 x 10(6) s(-1)。MeSO2Cl(.)(-) 和 MeSO2(.) 在 UV 中表现出相似的吸收,λmax 为 320 nm。在氧气存在的情况下,MeSO2Cl(.)(-) 将一个电子转移到 O(2) 并与超氧化物建立平衡。正向反应的速率常数测量为 4.1 x 10(9) M(-1) s(-1),而反向反应的速率常数仅为 1.7 x 10(5) 到 1.7 x 10(6) M (-1) s(-1) 可以估计,对较低的值有更高的置信度。这对应于 2.4 x 10(3) 到 2.4 x 10(4) 范围内的平衡常数。参考 E 度 (O2/O2(. )(-)) = -155 mV,磺酰氯对的氧化还原电位,E