On the Beckmann rearrangement of ketoximes: A kinetic study in trifluoromethanesulfonic acid
作者:N. C. Marziano、L. Ronchin、C. Tortato、O. Tonon、R. Bertani
DOI:10.1002/kin.20011
日期:2004.8
in the Beckmann rearrangement of 2,4,6-trimethylacetophenone oxime have been studied in concentrated trifluoromethanesulfonic acid by kinetic and spectroscopic measurements. Observed (kobs) and thermodynamic rate constants (ko) have been estimated and the values compared with the ones obtained in perchloric, sulfuric, and methanesulfonic acids. In the range 80–100 wt% of sulfuric acid, combined analysis
已经通过动力学和光谱测量在浓三氟甲磺酸中研究了参与 2,4,6-三甲基苯乙酮肟的贝克曼重排的中间体的形成和破坏。已估计观察到的 (kobs) 和热力学速率常数 (ko),并将这些值与在高氯酸、硫酸和甲磺酸中获得的值进行了比较。在 80-100 wt% 的硫酸范围内,对 kobs 和 ko 速率的综合分析表明,由于 [H2SO4] 物种具有特定的催化作用。在三氟甲磺酸中,与硫酸中的值相比,已观察到较低的速率常数,其差异为 99 wt%,相差 103 倍。不同强酸的催化作用,从拉曼和核磁共振光谱推断的中间体结构,并讨论了参与反应的离子对的作用。© 2004 Wiley Periodicals, Inc. Int J Chem Kinet 36: 417–426, 2004