13C,31P and1H NMR studies of chiral bis[(4R,6R)-4,6-dimethyl-1, 3, 2-dioxaphosphorinan-2-yloxy]alkane derivatives. Coupling between phosphorus atoms six bonds apart
作者:G. Szalontai、J. Bakos、I. Tóth、B. Heil
DOI:10.1002/mrc.1260250905
日期:1987.9
13C, 1H and 31P NMR investigations were carried out to confirm the stereochemistry of novel bis[(4R,6R)-4,6-dimethyl-1,3,2-dioxaphosphorinan-2-yloxy]alkanes. The 13C NMR spectra exhibited second-order features at room temperature. Substantial coupling was found between P atoms six bonds apart. The possibility of a through-space contribution was tested. Spatially close P atoms and the strongly electronegative P substituents (oxygen atoms) are thought to be responsible for the enhanced P… P coupling.
为了确认新型双[(4R,6R)-4,6-二甲基-1,3,2-二氧磷杂环己烷-2-基氧基]烷烃的立体化学结构,对其进行了 13C、1H 和 31P NMR 研究。13C NMR 光谱在室温下显示出二阶特征。在相隔六个键的 P 原子间发现了大量耦合。测试了通空贡献的可能性。空间上接近的 P 原子和强电负性 P 取代基(氧原子)被认为是 P... P 耦合增强的原因。