Neighbouring group participation in the gas-phase pyrolysis kinetics of 4-(N-methyl-N-phenylamino)-1-butyl acetate and 4-(N-phenylamino)-1-butyl acetate
作者:Gabriel Chuchani、Nouria Al-Awadi、Rosa M. Dom�nguez、Alexandra Rotinov、Armando Herize、Kamini Kaul
DOI:10.1002/1099-1395(200005)13:5<266::aid-poc240>3.0.co;2-q
日期:2000.5
the following equations: for 4-(N-methyl-N-phenylamino)-1-butyl acetate, log[k1 (s−1)] = (13.92 ± 0.36) − (210.4 ± 4.5) kJ mol−1 (2.303RT)−1; and for 4-(N-phenylamino)-1-butyl acetate, log[k1 (s−1)] = (12.03 ± 0.43) − (188.3 ± 5.3) kJ mol−1 (2.303RT)−1. The decomposition of these substrates undergoes a parallel reaction. The predominant primary product, the corresponding heterocyclic product, appears
在温度范围 359.7–399.6 °C 和压力范围 23.8–95 Torr 的静态系统中测定了两种乙酸苯氨基丁酯的热解动力学。在用烯丙基溴处理过的容器中和在自由基抑制剂甲苯存在下的反应是均相的和单分子的,并且遵循一级速率定律。总速率系数由以下等式表示:对于 4-(N-甲基-N-苯基氨基)-1-乙酸丁酯,log[k1 (s-1)] = (13.92 ± 0.36) - (210.4 ± 4.5) kJ mol-1 (2.303RT)-1; 对于 4-(N-苯基氨基)-1-乙酸丁酯,log[k1 (s-1)] = (12.03 ± 0.43) - (188.3 ± 5.3) kJ mol-1 (2.303RT)-1。这些底物的分解发生平行反应。主要的初级产品,相应的杂环产品,似乎是氨基取代基对背面置换的非嵌合辅助的结果。这表明在消除过程中可能存在一种初始离子对类型的机制。提出并讨论了每种乙酸氨基丁酯底物平行分解的