The non-equivalence of the apical fluorine atoms was observed in the low temperature 19F n.m.r. spectra of the alkoxyfluorophosphoranes (I) and (II), and is attributed to the adjacent asymmetric carbon atom and not to a hindered rotation of the alkoxy-group.
D. U. Robert, D. J. Costa and J. G. Riess, J. Chem. Soc., Chem. Commun., 1973, 745 DOI: 10.1039/C39730000745
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