Thermolysis kinetics of diethyl 2,3-dicyano-2,3-di(p-substituted phenyl)succinates
作者:Chenze Qi、Linjun Shao、Yueqing Lu、Chen Wang、Xian-Man Zhang
DOI:10.1002/poc.1950
日期:2012.6
intrinsic thermolysis rate constants of the central carbon–carbon bond during the dl/meso isomerization of diethyl 2,3‐dicyano‐2,3‐di(p‐substituted phenyl)succinates (G=H, Me, OMe, Cl, and NO2) at temperatures ranging from 80 to 120 °C. The obtained rate constants are significantly affected by the polarity of the para substituents, in sharp contrast to their negligible effects on the dl/meso isomerization
的实验方法的开发是为了确定中心碳-碳键的固有热解速率常数在DL /内消旋二乙基2,3-二氰基2,3-二(异构化p取代的苯基)琥珀酸酯(G = H, Me,OMe,Cl和NO 2)在80至120°C的温度范围内。所获得的速率常数受对位取代基的极性的显着影响,与它们对dl / meso的可忽略的影响形成鲜明对比异构化平衡常数。此外,取代基对活化焓的影响可以与哈米特取代基的共振常数和2-氰基-2-(乙基-p-取代的苯基)的苄基CH键的均质解离焓(键解离能)线性相关。醋酸盐。版权所有©2011 John Wiley&Sons,Ltd.