Synthesis, structure, and dynamic behavior in solution of arylamino-1,3,5-triazines
作者:P. A. Belyakov、A. V. Shastin、Yu. A. Strelenko
DOI:10.1007/s11172-006-0135-0
日期:2005.10
3,5-triazines were synthesized and studied by dynamic NMR spectroscopy. The free energies of the hindered rotation ΔG≠?are in 59–77 kJ mol− 1 range. Using difference-mode NOE NMR experiments, the structures of the major and minor rotation isomers were proved. The DFT B3LYP/6-31G* calculations were performed. The difference between the calculated rotation barriers and the experimental values obtained
十个不对称取代的芳基氨基-1,3,5-三嗪合成并通过动态核磁共振光谱研究。受阻旋转的自由能 ΔG≠? 在 59–77 kJ mol− 1 范围内。使用差模 NOE NMR 实验,证明了主要和次要旋转异构体的结构。进行了 DFT B3LYP/6-31G* 计算。计算出的旋转障碍与通过线形分析获得的实验值之间的差异小于 7.6 kJ mol-1。旋转势垒的高度在 18 kJ mol-1 范围内变化,具体取决于三嗪环中的取代基。