Synthesis and conformation of 2-dimethoxyphosphoryl-1,3-diselenanes. The first evidence for SeCP anomeric interactions.
作者:Marian Mikołajczyk、Maciej Mikina、Piotr Graczyk、Michał W. Wieczorek、Grzegorz Bujacz
DOI:10.1016/s0040-4039(00)79901-1
日期:1991.8
Analysis of the 1H and 13C NMR spectra of conformationally labile 2-dimethoxyphosphoryl-5,5-dimethyl-1,3-diselenane and equilibration of the diastereoisomeric cis-2 and trans-2 revealed that the anomeric effect of magnitude about ΔG° A E=10 kJmol−1 is operating in SeC- system. Crystallographic data are in accord with the interplay of the nS e -σ* C − P negative hyperconjugation and repulsive interactions
构象不稳定的2-二甲氧基磷酰基-5,5-二甲基-1,3-二硒烷的1 H和13 C NMR光谱分析以及非对映异构体cis - 2和trans - 2的平衡表明,端基异构化效应的幅度约为ΔG° AE = 10 kJmol -1在SeC-系统中运行。晶体学数据是在与之间的相互作用一致n个发E -σ* Ç - P负超共轭和磷酰基氧孤电子对和在内环硒原子孤对之间排斥相互作用在反式- 2。