Varying resonance demands in substituent effects. Acetolysis of neophyl p-bromobenzenesulfonates
作者:Mizue Fujio、Kimito Funatsu、Mutsuo Goto、Masaaki Mishima、Yuho Tsuno
DOI:10.1016/s0040-4020(01)89958-0
日期:1987.1
Rates of acetolysis of 2-aryl-2-methylpropyl p-bromobenzenesulfonates were determined for an extended series of substituents. The substituent effect can be described accurately in terms of our LArSR relationship (Yukawa-Tsuno Equation), giving an r value of 0.57. The correlation result can be reasonably accounted for on the basis of the accepted mechanism of this reaction, involving a rate-determining
确定了一系列扩展的取代基的2-芳基-2-甲基丙基对溴苯磺酸的乙酰分解速率。可以根据我们的LArSR关系(Yukawa-Tsuno方程)准确描述取代基效应,得出r值为0.57。可以基于该反应的公认机理来合理地解释相关结果,该机理涉及速率确定芳基辅助的过渡态。本研究得出的结论是,该唯一的r值应与该反应的芳基辅助电离过程的共振需求特征有关。批评了Brown ϱσ +方程的简单应用或扩展处理以及基于其的解释。