Oxidative fluorination in the Ph<sub>2</sub>SO–XeF<sub>2</sub>–Cl<sup>−</sup> system and fluorine exchange in the Ph<sub>2</sub>S(O)F<sub>2</sub>–Ph<sub>2</sub>S(O)F<sup>+</sup> system
作者:Xiaobo Ou、Alexander F. Janzen
DOI:10.1139/v96-228
日期:1996.11.1
occurs under mild conditions in the presence of chloride ion to give Ph,S(O)F, in quantitative yield. Chloride ion appears to react with xenon difluoride to generate fluoride ion, and a mechanism of oxidative fluorination is proposed that involves anionic Ph,S(O)F and radical Ph,S(O)F' intermediates. Addition of cationic Ph,S(O)F to Ph,S(O)F, initiates rapid fluorine exchange, presumably via a symmetrical
二苯基亚砜与二氟化氙在温和条件下在氯离子存在下发生氧化氟化,以定量收率得到 Ph,S(O)F。氯离子似乎与二氟化氙反应生成氟离子,并提出了一种氧化氟化机制,涉及阴离子 Ph,S(O)F 和自由基 Ph,S(O)F' 中间体。将阳离子 Ph,S(O)F 添加到 Ph,S(O)F,引发快速的氟交换,推测是通过对称的氟桥接中间体,并且该交换过程由 13c 和 19~ NMR 光谱监测。在氯离子存在的情况下,形成 Ph,S(O)Cl,可以通过 'k NMR 及其水解为 Ph,SO, 进行鉴定。提出了这些反应的机理,并对假定的中间体进行了从头算分子轨道计算 (GAUSSIAN~Z)。RCsumC : La fluoration oxydante du diphCnylsulfoxyde par le difluorure de xCnon s'effectue dans des conditions