Abstract
The natural abundance 13C nuclear magnetic resonance spectra of a number of isoquinoline alkaloids and related model compounds have been recorded. In almost all cases comparison of the spectra of the alkaloids with those of the model compounds has permitted unambiguous assignment of the alkaloid carbon resonances. The ability of 13C nmr spectroscopy to distinguish between diastereomeric pairs of both protoberberine and phthalideisoquinoline alkaloids has been demonstrated.
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