into the nature and conformational dependence of long-range 4JHF couplings in α-fluoro amides. The dependence of 4JHF on substituents and the solvent was investigated. H–F coupling constants determined by NMR spectroscopy are in agreement with DFT calculations. NBO analysis revealed that a favourable nF→σNH* interaction correlates with the magnitude of 4JHF.
结合实验和计算方法,可以深入了解α-
氟代酰胺中远程4 J HF偶联的性质和构象依赖性。研究了4 J HF对取代基和溶剂的依赖性。通过NMR光谱确定的HF耦合常数与DFT计算一致。NBO分析表明,有利的Ñ ˚F →σ NH与*的大小相互作用相关因素4 Ĵ HF。