Substituent Effect Studies of Aryl-Assisted Solvolyses. II. The Acetolysis of 2-Phenyl-2-(substituted phenyl)ethyl<i>p</i>-Toluenesulfonates
作者:Mizue Fujio、Yasuyuki Maeda、Mutsuo Goto、Yoshihiro Saeki、Masaaki Mishima、Yuho Tsuno
DOI:10.1246/bcsj.66.3021
日期:1993.10
The substituent effect on the acetolysis of 2-phenyl-2-(substituted phenyl)ethyl p-toluenesulfonates had a nonlinear LArSR correlation and was explicable in terms of a competitive aryl-assisted mechanism involving the X-substituted phenyl-assisted () pathway and the unsubstituted phenyl-assisted () pathway. By the application of the iterative nonlinear least-squares method based on the LArSR Eq., the
取代基对 2-苯基-2-(取代苯基)乙基对甲苯磺酸酯的乙酰化作用具有非线性 LArSR 相关性,并且可以根据涉及 X 取代苯基辅助 () 途径的竞争性芳基辅助机制进行解释。未取代的苯基辅助 () 途径。通过应用基于 LArSR 方程的迭代非线性最小二乘法,将取代基对整体 kt 的影响分解为 ρM = -3.53 和 rM = 0.60 的最佳拟合 kM 相关性,以及 ρN 的 kN 相关性= -0.88 σ0。辅助芳基取代基效应的 ρM 和 rM 值非常接近于 2-甲基-2-苯丙基体系的值,并且辅助芳基的小 ρN 值与未升高的 σ0 常数与远程 β-芳基效应相容。基于取代基效应分析分析的竞争途径的相对速率与通过 13C-示踪法确定的各个芳基迁移产物的比例完全一致。精确的 ...