Structural analysis of hydantoins and 2-thiohydantoins in solution using 13C, 1H NMR coupling constants
作者:Erzsébet Ösz、László Szilágyi、János Marton
DOI:10.1016/s0022-2860(97)00357-8
日期:1998.2
hydantoin- and 2-thiohydantoin derivatives in DMSO-d6 solution using one- and two-dimensional NMR techniques. Simultaneous consideration of several coupling data allowed reliable estimates to be deduced for the ring dihedrals equivalent to the ϕ, ψ and ω angles in peptides. These data are in support of a quasi-planar geometry for the hydantoin ring in solution in close agreement with previous results obtained
摘要 一键、二键和三键碳13;已经使用一维和二维 NMR 技术确定了 DMSO-d6 溶液中一系列乙内酰脲和 2-硫代乙内酰脲衍生物的质子标量自旋-自旋耦合常数 (1JC,H, 2JC,H,3JC,H)。同时考虑几个耦合数据允许对等效于肽中的 φ、ψ 和 ω 角的环二面角进行可靠的估计。这些数据支持溶液中乙内酰脲环的准平面几何形状,与先前为固态获得的结果非常一致。已经确定了一些 5-取代衍生物的 C5C1' 键周围的旋转异构体群分布。首次证明了咪唑烷环的 1,3-位酰胺 NH 质子之间存在四键偶联。