The decomposition of aliphatic <i>N</i>-nitro amines in aqueous sulfuric acid. Bisulfate as a nucleophile
作者:Robin A. Cox
DOI:10.1139/v96-197
日期:1996.10.1
calculation of activation parameters for both nucleophiles. The reaction appears to be mainly enthalpy controlled. The intercept standard-state rate constants are well correlated by the σ* values for the alkyl groups; the slopes are negative, with a more negative value for the slower bisulfate reaction. Interestingly the m≠m* slopes also correlate with σ*, although the scatter is bad. Key words: N-nitro amines
在硫酸水溶液中,脂肪族 N-硝基胺分解为 N2O 和醇。观察到的反应速率常数的过量酸度分析表明没有形成游离碳正离子。该反应是质子化的酸硝基互变异构体的酸催化 SN2 置换,亲核试剂在酸度低于 82-85% H2SO4 时是水分子,在更高酸度时是硫酸氢根离子。硫酸氢盐是较差亲核试剂的约 1000。研究了 12 种化合物,其中在几种不同温度下获得的 9 种化合物的结果能够计算两种亲核试剂的活化参数。该反应似乎主要受焓控制。截距标准状态速率常数与烷基的 σ* 值密切相关;斜率是负的,较慢的硫酸氢盐反应具有更负的值。有趣的是,m≠m* 斜率也与 σ* 相关,尽管分散性很差。关键词:N-硝基胺,过酸,硫酸氢盐,正...