A series of phosphonochloridates was prepared from the corresponding phosphonate monoesters, and their reactions with alcohols, amines, and the bisnucleophile 4-aminobutan-1-ol have been investigated using 31P NMR spectroscopy. In the conversion of phosphonate monoesters to phosphonochloridates via the addition of thionyl chloride or oxalyl chloride, pyrophosphonate anhydrides were found to be formed
从相应的
膦酸酯单酯制备了一系列膦酰
氯,并使用 31 P NMR 光谱研究了它们与醇、胺和双亲核试剂 4-
氨基丁-1-醇的反应。在通过加入亚
硫酰氯或
草酰氯将
膦酸单酯转化为膦酰
氯时,发现焦
膦酸酐很容易作为副产物形成。酸酐很容易与醇反应,但比相应的膦酰
氯反应更慢,而且与胺反应也很缓慢,如果有的话。因此,在制备膦酰胺时,必须抑制酸酐的形成。这是在将单酯添加到
氯化剂中时完成的。不受阻碍的膦酰
氯主要与 4-
氨基丁-1-醇的
氨基官能团反应以提供膦酰胺,而空间位阻的膦酰
氯表现出对 O 偶联的偏好。该结果表明在 P−O b 期间获得的能量...