The kinetics of hydrogen-isotope exchange at the nitrogen atom of substituted anilinium ions. Part 2. The nitrosonium-ion-catalysed reaction
作者:Derick J. Mills、John H. Ridd
DOI:10.1039/p29800000637
日期:——
catalysed exchange based on the formation of a loose complex between the nitrosonium ion and the anilinium ion followed by proton loss from the nitrogen pole. This process is shown to be related to the direct diazotisation of some anilinium ions and to the nitrous-acid-catalysed nitration and oxidation of the NN-dimethylanilinium ion. Substituent effects on the nitrosonium-ion-catalysed exchange are much
亚硝鎓离子催化的N-H质子之间氢的同位素交换NN -dimethylanilinium离子和硫酸水溶液(83-93%)。在所用的酸度下,胺和硝基离子之间的后续化学反应发生的速度要慢得多。催化交换的速率与硝基离子的浓度成正比,与适当的酸度函数(h 0 ‴)成反比。提出了一种基于硝基离子与苯胺离子之间疏松络合物的形成,随后质子从氮极流失的催化交换机理。结果表明,该过程与某些苯胺离子的直接重氮化以及亚硝酸催化的硝化和氧化有关。NN-二甲基苯胺离子。取代基对硝基离子催化的交换作用远小于酸催化的交换作用,并且与酸催化的重氮化机理相似。