Reinvestigation of the 31P NMR evidence for the formation of diorganyl phosphoropyridinium intermediates
作者:Johan Nilsson、Adam Kraszewski、Jacek Stawinski
DOI:10.1039/b107792a
日期:2001.11.29
A 31P NMR study on the reactions of diphenyl and diethyl chlorophosphates/bromophosphates with pyridine showed that equilibria of these reactions are heavily shifted to the left and thus concentrations of the putative diorganyl phosphoropyridinium chlorides/bromides are usually below the detection level of this spectroscopic method. However, when diphenyl iodophosphate was subjected to reaction with pyridine, we were able for the first time to observe the formation of a diorganyl phosphoropyridinium intermediate by 31P NMR spectroscopy.
对二苯基和二乙基氯磷酸酯/溴磷酸酯与吡啶反应的31P核磁共振研究显示,这些反应的平衡强烈偏向左侧,因此理论上产生的二有机基磷吡啶盐氯化物/溴化物的浓度通常低于该光谱学方法的检测水平。然而,当二苯基碘磷酸酯与吡啶反应时,我们首次能够通过31P核磁共振光谱观察到二有机基磷吡啶盐中间体的形成。