2 H N.m.r. spectroscopy has been used to demonstrate that in specifically labelled deoxyloganin, the label at C-8 is retained during its conversion into cornin in Verbena officinalis, suggesting that the 6-oxo group is produced by oxidation in an unactivated position.
S. Damtoft, S. R. Jensen and B. J. Nielsen, J. Chem. Soc., Chem. Commun., 1980, 42 DOI: 10.1039/C39800000042
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