NMR and X-ray crystallographic studies of axial and equatorial 2-ethoxy-2-oxo-1,4,2-oxazaphosphinane
作者:Irma Linzaga、Jaime Escalante、Miguel Muñoz、Eusebio Juaristi
DOI:10.1016/s0040-4020(02)01152-3
日期:2002.10
KH yielded a 97:3 mixture of the interesting, phosphorus-containing 2-ethoxy-2-oxo-1,4,2-oxazaphosphinanes (2S,5S)-1 and (2R,5S)-1. Suitable crystals of both diastereomers were used in X-ray crystallographic studies that permitted unequivocal configurational assignment, as well as examination of the consequences of nO→σP–O∗ stereoelectronic interactions on structural properties.
在亚磷酸二乙酯存在下,将(S)-(N-苄基)-苯基甘醇与甲醛缩合,得到羟基氨基膦酸酯(S)-3,用KH处理后得到97:3有趣的含磷2-乙氧基- 2-氧代-1,4,2-氧杂氮膦(2 S,5 S)-1和(2 R,5 S)-1。在X射线晶体学研究中使用了两种非对映异构体的合适晶体,这些晶体允许明确的构型分配,并检查n O →σP –O ∗的后果 立体电子相互作用对结构性能的影响。