Reinvestigation of the 31P NMR evidence for the formation of diorganyl phosphoropyridinium intermediates
Nilsson, Johan; Kraszewski, Adam; Stawinski, Jacek; Nilsson Johan; Department of Organic Chemistry, Arrhenius Laboratory; Kraszewski Adam; Institute of Bioorganic Chemistry, Polish Academy of Sciences; Stawinski Jacek; Department of Organic Chemistry, Arrhenius Laboratory; Institute of Bioorganic Chemistry, Polish Academy of Sciences
Журнал:
Journal of the Chemical Society, Perkin Transactions 2
Дата:
2001
Аннотация:
A <sup>31</sup>P 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 <sup>31</sup>P NMR spectroscopy.
76.51Кб