Base-Catalyzed Acyl Exchange Reactions of<i>N</i>,<i>O</i>-Diacyl-<i>o</i>-aminophenols. Substituent and Temperature Effects on the Equilibrium Constants
作者:Tadamitsu Sakurai、Tohru Nagaoka、Jun Kamiya、Hiroyasu Inoue
DOI:10.1246/bcsj.69.775
日期:1996.3
Substituent and temperature effects on the equilibrium constants for the triethylamine-catalyzed acyl exchange reactions of N-(substituted benzoyl)-O-acetyl-o-aminophenols have been investigated by 1H NMR spectroscopy. It was found that the standard enthalpy change ΔH° in acyl exchange processes, estimated from temperature dependence of the equilibrium constant, correlates well with the standard free
取代基和温度对三乙胺催化的 N-(取代苯甲酰基)-O-乙酰基-o-氨基苯酚的酰基交换反应的平衡常数的影响已通过 1 H NMR 光谱进行了研究。发现酰基交换过程中的标准焓变ΔH°,根据平衡常数的温度依赖性估计,与用作异构体对相对稳定性的量度的标准自由能变化ΔG°密切相关,而标准熵变 ΔS° 近似恒定 (-6 ± 2 JK-1 mol-1),与引入的苯甲酰基中的取代基无关。