作者:Merete L. Skar、John S. Svendsen
DOI:10.1016/s0040-4020(97)10191-0
日期:1997.12
The dibenzofuran-based diamide 4,6-bis(N-acyl-aminomethyl)dibenzofuran is shown by 1H NMR and IR to have favourable geometry for intramolecular hydrogen bonding. The corresponding dibenzothiophene-based diamide 4,6-bis(N-acyl-aminomethyl)dibenzothiophere does not fulfill the geometric requirements for intramolecular hydrogen bonding. The intramolecularly hydrogen bonded state of the dibenzofuran-based
1 H NMR和IR表明,基于二苯并呋喃的二酰胺4,6-双(N-酰基-氨基甲基)二苯并呋喃具有用于分子内氢键的有利的几何形状。相应的基于二苯并噻吩的二酰胺4,6-双(N-酰基-氨基甲基)二苯并噻吩不满足分子内氢键的几何要求。发现二苯并呋喃基二酰胺1a的分子内氢键合状态与非氢键合状态相比,在焓上更有利于1±0.5 kcal / mol,而在熵上则不利于4±2 cal /(K·mol)。