Magnetic non-equivalence of diastereotopic oxygens in phenyl 1-phenylethyl and phenyl 1-phenyl-propyl sulphones has been observed in their 17O n.m.r. spectra and a configurational assignment has been made by stereospecific labelling with 17O.
K. Kobayashi, T. Sugawara and H. Iwamura, J. Chem. Soc., Chem. Commun., 1981, 479 DOI: 10.1039/C39810000479
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