Thermolysis of 3-carbomethoxycyclobutene-3-carboxylic acid afforded two dienes in equal amounts, which is consistent with our prediction. The structures of the dienes were determined by long range coupling constants between the carbonyls and β-olefinic protons by long range selective proton decoupling. theoretical prediction. The structure analysis of the dienes was made by 3JCH long range coupling
3-羰基甲氧基
环丁烯-3-
羧酸的热解可得到等量的两个二烯,这与我们的预测相符。二烯的结构由羰基和β-烯烃质子之间的长距离偶合常数通过长距离选择性质子解耦来确定。理论预测。二烯的结构分析是通过羰基和β质子之间的3 J CH长程耦合常数进行的。