Intramolecular Electron Transfer and S<sub>N</sub>2 Reactions in the Radical Anions of 1-Benzoyl-ω-haloalkane Studied by Pulse Radiolysis
作者:Norio Kimura、Setsuo Takamuku
DOI:10.1246/bcsj.64.2433
日期:1991.8
a pulse radiolysis technique. The reaction mechanism, electron transfer (ET) or SN2, and the rate constants were found to change as a function of the nature of the halide and the methylene chain length of the substrate. Although the order of reactivity based on leaving halogen atoms was I, Br, and Cl, the ease of the SN2 reaction was found to be in the order Cl>Br>I. In addition, the reaction rates
已通过使用脉冲辐解技术研究了溶剂化电子对 1-苯甲酰基-ω-卤代烷烃(Cl、Br、I)的单电子还原以及由此形成的自由基阴离子的后续分子内反应。发现反应机制、电子转移 (ET) 或 SN2 和速率常数随着卤化物的性质和底物的亚甲基链长度而变化。尽管基于离开卤素原子的反应性顺序是 I、Br 和 Cl,但发现 SN2 反应的容易程度是 Cl>Br>I。此外,反应速率也受所用溶剂极性的影响。在这些结果的基础上,讨论了 ET-SN2 二分法是如何发生的。