Solvation and steric effects on electrophilic reactivity of ethylenic compounds. 2. Kinetic criteria for nucleophilic assistance and return in bromination
作者:Marie-Francoise Ruasse、Shahrokh Motallebi、Bernard Galland
DOI:10.1021/ja00009a032
日期:1991.4
Three kinetic criteria, m Br , R(k aqEtOH /k AcOH ) Y , and KSIE (kinetic solvent isotope effect), are used to estimate the magnitude of the electrophilic and nucleophilic involvement of prostic solvents and the occurrence of return in the bromination of alkenes. m Br are obtained from m Br Y Br correlations using only water, methanol, ethanol, and their aqueous mixtures, whose nucleophilicities are
三个动力学标准,m Br ,R(k aqEtOH /k AcOH ) Y 和 KSIE(动力学溶剂同位素效应),用于估计前体溶剂的亲电和亲核参与的程度以及溴化反应中返回的发生烯烃。m Br 仅使用水、甲醇、乙醇及其水溶液混合物从 m Br Y Br 相关性中获得,其亲核性几乎相同。R 是与亲核性较低的乙酸和偶尔三氟乙醇的 Winstein-Grunwald 图的偏差。MeOD 或 EtOD 中的 KSIE 与因子 Φ Br 进行比较 - 对应于完全发展的溴离子的最大值。这些标准的值是针对亚甲基金刚烷和烷基苯测量的,它们分别通过 Ad E Cl 和 Ad E C2 中间机制溴化