Kinetics and mechanism of thermal gas-phase elimination of ?-substituted carboxylic acids: role of relative basicity of ?-substituents and acidity of incipient proton
作者:Nouria A. Al-Awadi、Kamini Kaul、Osman M. E. El-Dusouqui
DOI:10.1002/1099-1395(200009)13:9<499::aid-poc269>3.0.co;2-0
日期:2000.9
2-Phenoxypropanoic acid together with five of its aryl derivatives, its phenylthio and its N-phenylamino analogues were pyrolyzed at 494–566 K. The reactions were homogeneous, polar and free from catalytic and radical pathways, and obeyed a first-order rate equation. The limits of the Arrhenius log A (s−1) and E (kJ mol−1) values obtained for these reactions averaged 11.98 ± 1.71 and 158.1 ± 17.4,
2-苯氧基丙酸及其五种芳基衍生物、苯硫基及其 N-苯氨基类似物在 494-566 K 下热解。反应均相、极性、无催化和自由基途径,并服从一级速率方程. 这些反应获得的 Arrhenius log A (s-1) 和 E (kJ mol-1) 值的平均值分别为 11.98 ± 1.71 和 158.1 ± 17.4。对热解物的分析表明消除产物是一氧化碳、乙醛和相应的苯酚、苯硫酚或苯胺化合物。还在 638-792 K 的温度范围内研究了 2-苯氧基和 2-(N-苯基氨基)-1-丙醇的热解。动力学结果和产物分析支持涉及五元环状极性的反应途径过渡状态。