Noncovalent Interactions of Fluorine with Amide and CH<sub>2</sub> Groups in <i>N</i>-Phenyl γ-Lactams: Covalently Identical Fluorine Atoms in Nonequivalent Chemical Environments
We designed and synthesized N-phenyl γ-lactam derivatives possessing two covalently identical ortho-F nuclei on the N-phenyl group. The F nuclei sited in different chemical environments where they were spatially adjacent to amide and alkyl groups due to hindered rotation around the central N–Ar bond. 19F NMR spectroscopic and X-ray crystallographic methods were used to distinguish the axially prochiral
我们设计并合成Ñ具有两个共价相同苯基γ-内酰胺衍生物的邻位上的-F核Ñ -苯基。F核位于不同的化学环境中,由于绕中心N-Ar键的旋转受阻,它们在空间上与酰胺和烷基相邻。使用19 F NMR光谱和X射线晶体学方法区分轴向前手性F核,并为F和酰胺/ CH 2基团之间的空间相互作用提供结构见解。提供了有关F··酰胺和F··CH 2对中多极相互作用的直接光谱证据。