New, configurationally isomeric phosphonates of the 5,5-disubstituted 2-oxo-1,3,2-dioxaphosphorinan series have been prepared. Variable-temperature studies and ABX analyses of the 1H n.m.r. spectra suggest that they are conformationally mobile systems.
                                    已经制备了5,5-二取代的2-氧代-1,3,2-二氧杂
磷酰亚
氨基系列的新的构型异构的
膦酸酯。1 H nmr光谱的可变温度研究和ABX分析表明,它们是构象上可移动的系统。