Hetera-<i>p</i>-carbophanes. III. Conformation of Amide Groups in and Internal Rotation of Diaza[<i>n</i>]paracyclophanes with Two Alkoxy Groups at the Benzene Ring
作者:Kazuhiko Sakamoto、Michinori Oki
DOI:10.1246/bcsj.48.497
日期:1975.2
A series of diazadioxo[n]paracyclophane derivatives with two alkoxy groups at the benzene ring were prepared. The conformation of amide groups in these compounds were studied by infrared, PMR, and 13C NMR spectra to draw a conclusion that both amide groups are s-trans. Thus the infrared absorptions at 3430 and 3405 cm−1 are attributed to N–H···π interacting and N–H···O bonded trans forms, respectively
制备了一系列在苯环上具有两个烷氧基的二氮杂二氧[n]对环烷衍生物。通过红外、PMR 和 13C NMR 光谱研究了这些化合物中酰胺基团的构象,得出两个酰胺基团都是 s-trans 的结论。因此,在 3430 和 3405 cm-1 处的红外吸收分别归因于 N–H…π 相互作用和 N–H…O 键合反式。当芳香环的旋转缓慢时,NCH2 质子与不对称中心被 5 个键隔开,以及苄质质子被发现是不等价的。在不同温度下研究的化合物的 PMR 光谱表明,在苯环上引入烷氧基取代甲基在很大程度上增加了芳环旋转的障碍。