A New Approach Using Aromatic-Solvent-Induced Shifts in NMR Spectroscopy to Analyze β-Lactams with Various Substitution Patterns
作者:Leticia Chavelas-Hernández、Jonathan R. Valdéz-Camacho、Luis G. Hernández-Vázquez、Blanca E. Dominguez-Mendoza、María G. Vasquez-Ríos、Jaime Escalante
DOI:10.1055/s-0039-1691498
日期:2020.1
The chemical shifts of protons depend not only on the properties of the solute molecule but also on the medium in which the solute resides. A series of β-lactams with various substitution patterns were synthesized to study aromatic-solvent-induced shifts (ASISs) in chloroform and benzene by using 1H NMR spectroscopy. The results agreed with those obtained by theoretical density functional theory calculations
质子的化学位移不仅取决于溶质分子的性质,还取决于溶质所在的介质。合成了一系列具有各种取代模式的 β-内酰胺,以使用 1 H NMR 光谱研究氯仿和苯中的芳烃溶剂引起的位移 (ASIS)。结果与理论密度泛函理论计算得出的结果一致。β-内酰胺环的质子受ASIS效应影响最大,由于苯的各向异性效应,它们往往会重叠。