Studies of phosphorus–phosphorus nuclear-spin coupling in species with phosphorus–nitrogen bonds
作者:Ian J. Colquhoun、William McFarlane
DOI:10.1039/dt9770001674
日期:——
used to study 34 organophosphorus spacies with a P–N–P skeleton. The geminal 31P–31P coupling constant is large and positive in derivatives of three-co-ordinate phos-phorus and is increased by bulky or electronegative substituents on phosphorus. The results for several pairs of diastereoisomers, and also the temperature dependence, indicate a strong conformational dependence of the coupling which is
1 H- 31 P}双共振实验已用于研究34个具有P–N–P骨架的有机磷空间。在三坐标磷的衍生物中,双生的31 P– 31 P耦合常数大且为正,并通过磷上的庞大或带负电的取代基而增加。几对非对映异构体的结果以及温度依赖性表明偶联的强烈构象依赖性,这与孤对在磷上的相对取向有关。在具有至少一个四配位磷原子的空间中,没有最后一个特征,并且偶联常数小得多。