have internal amine groups are less in energy than the other ones that have internal carbonyl groups. The solvent polarity does not appreciably affect the stability trend of the three conformers of each compound due to their comparable dipole moments. A complete and thorough survey of proton affinity (PA) and proton detachment energies (PDE) on each of the possible sites has been performed.
通过适当的二
钾盐与相应的双(卤)化合物在回流的
DMF中进行亲核反应,制备了一系列新的苯并取代的大环二酰胺。在回流的
甲苯中用Lawesson试剂处理新的大环二酰胺会导致以高收率形成相应的大环二
硫代二酰胺。在一些研究的大环上,在半经验
水平
AM1上进行了分子轨道计算。热力学函数表明,具有内部胺基的气相中最稳定的结构比具有内部羰基的其他结构的能量更少。由于它们的可比偶极矩,溶剂的极性不会明显影响每种化合物的三个构象异构体的稳定性趋势。