1-Oxonia-5-oxabicyclo[4.3.0]nonane and 1-oxonia-6-oxabicyclo[5.3.0]decane ions differ in the extent of charge delocalisation between the two oxygen atoms as shown by 1H and 13C n.m.r. spectroscopy in SO2 solution; trapping with triethylsilane leads to medium-ring diethers.
R. W. Alder, A. J. Miller and D. I. Rushbrook, J. Chem. Soc., Chem. Commun., 1989, 277 DOI: 10.1039/C39890000277
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