cyclopentadienes with a variety of substituted ethylenes were carried out, and their reaction rates and the endo : exo isomer ratios of the products were determined. It was shown that the faster reaction is characterized by a higher endo isomer distribution and the existence of a linear correlation between the reaction rate and the endo isomer distribution. The results were interpreted in terms of the concept of secondary
进行了
环戊二烯与各种取代
乙烯的狄尔斯-阿尔德反应,并测定了它们的反应速率和产物的内型:外型异构体比率。结果表明,较快反应的特征在于较高的内异构体分布以及反应速率与内异构体分布之间存在线性相关性。根据过渡态中次级轨道相互作用的概念来解释结果。