Observation of 18O induced isotope shifts in the 13C n.m.r. spectra of asteltoxin derived from [1-13C, 18O2]acetate and 18O2 gas established the origin of the oxygen atoms and clarified the mechanism of the formation of the 2,8-dioxabicyclo[3.3.0]octane moiety.
A. E. de Jesus, P. S. Steyn and R. Vleggaar, J. Chem. Soc., Chem. Commun., 1985, 1633 DOI: 10.1039/C39850001633
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