NMR studies of hindered rotation and thermal decomposition of novel 1-aryl-3,3-dialkyltriazenes
作者:Th. Lippert、A. Wokaun、J. Dauth、O. Nuyken
DOI:10.1002/mrc.1260301206
日期:1992.12
thermostability of these compounds was investigated by differential scanning calorimetry; activation energies of 240–280 kJ mol−1 were determined for the thermal decomposition. The hindered rotation of the dialkylamino group was studied by 1H NMR exchange measurements. Both experiments are interpreted in terms of an involvement of a 1,3‐dipolar structure of the NNN functional group. The influence of substituents
通过将取代苯胺衍生物的相应重氮盐与二烷基胺偶联,合成了 1-Aryl-3,3-二烷基三氮烯。通过差示扫描量热法研究了这些化合物的热稳定性;热分解的活化能为 240-280 kJ mol-1。通过 1 H NMR 交换测量研究二烷基氨基的受阻旋转。两个实验都被解释为涉及 NNN 官能团的 1,3-偶极结构。研究了芳环和氨基上的取代基对动力学和活化参数的影响;根据分子中偶极电荷分布的介孔和空间效应分析结果。