Kinetics and mechanism of the aminolysis of thiophenyl methylacetates in acetonitrile
作者:Hyuck Keun Oh、Jin Hee Yang、In Ho Cho、Hai Whang Lee、Ikchoon Lee
DOI:10.1002/1097-4601(2000)32:8<485::aid-kin6>3.0.co;2-x
日期:——
and cross-interaction constant ρXZ is relatively large and positive (0.90). These trends are consistent with the rate-limiting breakdown of a tetrahedral intermediate, T ± . The proposed mechanism is also supported by adherence of the rate data to the reactivity-selectivity principle (RSP). The kinetic isotope effects, kH/kD, are greater than unity (1.3-1.4) suggesting a possibility of hydrogen-bonded
交叉相互作用常数 ρXZ 较大且为正(0.90)。这些趋势与四面体中间体 T ± 的限速分解一致。速率数据遵守反应选择性原则 (RSP) 也支持所提出的机制。动力学同位素效应 kH/kD 大于单位 (1.3-1.4),表明可能存在氢键四中心过渡态。激活参数 ΔH ≠ 和 ΔS ≠ 与这种过渡态结构一致。