Kinetics and Mechanism of Nucleophilic Displacement Reactions of Y-Substituted Phenyl Benzoates with Cyanide Ion
作者:Song-I Kim、Eun-Hee Kim、Ik-Hwan Um
DOI:10.5012/bkcs.2010.31.03.689
日期:2010.3.20
Discussion The kinetic study was performed spectrophotometrically. All reactions proceeded with quantitative liberation of Y-substituted phenoxide ion (and/or its conjugate acid) under pseudo-first- order conditions (i.e., the nucleophile concentration in excess over the substrate concentration). The reactions obeyed first- order kinetics and pseudo-first-order rate constants (
Y 取代苯甲酸苯酯 (1) 和苯硫代苯甲酸苯酯 (2) 与 CN 反应的二级速率常数汇总 - 在 80 mol % H 2 O/20 mol % DMSO 中,温度为 25.0 ± 0.1 o C a entry Y p K a 10 2 k CN- / M –1 s –1 12a 4-MeO 10.20 0.843 b 2.13 b 4-Me 10.19 0.783 b 1.89 c 3-CH 3 10.08 0.724 - d H 9.95 1.02 b 2.75 e 4-Cl 9.38 2.32 - f 3-COMe 9.19 3.59 b - g 3-Cl 9.02 4.19 - h 3-CHO 8.98 3.93 - i 4-COOEt 8.50 6.07 - j 3-NO 2 8.35 14.1 b 18.0 k 4-COMe 8.05 7.68 b 7.88 l 4-CN 7