Halogen migration vs. hydrogen halogenide elimination in reactions of 1-chloro-2,2,2-trifluoroethansulfonyl chloride and 1,2,2,2-tetrafluoroethansulfonyl fluoride with amines: theoretical and experimental investigation
作者:Yuriy M. Pustovit、Anatoliy N. Alekseenko、Nikolai D. Volkov、Mykhailo Yu. Fedorchuk、Alexander B. Rozhenko
DOI:10.1016/j.jfluchem.2009.11.001
日期:2010.2
2,2-trifluoroethansulfonylchloride the chlorine migration proceeds forming the corresponding salts of 1,1-dichloro-2,2,2-trifluoroethansulfinic acid. This process as well as the alternative reaction, elimination of hydrogen halogenide, has been studied using quantum chemistry (DFT and MP2) methods. As the calculation data indicate, an intermediately formed anion undergo intramolecular chlorine migration
已经提出了一种简单且有用的方法来制备1-氯-2,2,2-三氟乙磺酸磺酰氯。通过1-氯-2,2,2-三氟乙磺酰氯的氨解,氯迁移进行,形成1,1-二氯-2,2,2-三氟乙亚磺酸的相应盐。已经使用量子化学(DFT和MP2)方法研究了该过程以及替代反应,即消除卤化氢。如计算数据所示,中间形成的阴离子经由三元环状过渡态经历分子内氯迁移。后者的特征在于低的活化能(ΔE = 27.0kcal / mol)。在1,2,2,2-四氟乙硫磺酰氟的情况下,活化的障碍要高得多(ΔE = 41.6kcal / mol)。1,1-二氯-2,2,2-三氟乙磺酸亚磺酸和1,1,2,2,2-五氟乙亚磺酸阴离子的结构可以认为是全卤代烷基阴离子与SO 2的供体-受体配合物。