reaction were measured in toluene solution for the Diels–Alder cycloaddition reaction of maleic anhydride (1) with a very active diene, 9,10‐dimethylanthracene (4), and with a very inactive diene, 9‐phenylanthracene (6), which is less reactive in the reaction with 1 by five orders of magnitude. Reaction rates under pressure up to 2600 bar were measured by using a high‐pressure optical cell, adjusted to a
在
马来酸酐(的狄尔斯-阿尔德环加成反应的
甲苯溶液进行测定的温度和压力范围,焓,熵,和激活和反应的体积速率常数1与一个非常活跃的二烯,的9,10dimethylanthracene)(4)和非常不活泼的二烯
9-苯基蒽(6),在与1的反应中反应性较低减少了五个数量级。压力高达2600 bar,反应压力是通过使用装有紫外分光光度计的高压光学元件测量的。反应体积通过两种独立的方法确定:反应物的部分摩尔体积的差异以及反应过程中溶液的特定体积对加合物浓度的依赖性。讨论了活化和反应的所有参数。