Abstract
Heteronuclear chemical shift correlation NMR experiments are invaluable in the proof of structure and conformations of proanthocyanidins and their derivatives because of their power in providing evidence for assignment of carbon resonances from 1H-NMR spectra or proton resonances from 13C-NMR spectra. C-H HETCOR experiments have been essential to assignment of the structure and conformation of two base-catalyzed rearrangement products obtained from (+)-catechin and polymeric procyanidins. Current work centers on NMR experiments to assist in definition of the conformations of proanthocyanidins and their derivatives. C-H HETCOR experiments provide the first unambiguous assignments of the 1H-NMR spectra of both rotameric forms of profisetinidin and procyanidin dimers with heterocyclic ring coupling constants essential to conformational analysis.
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© 1992 Springer Science+Business Media New York
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Hemingway, R.W., Ohara, S., Steynberg, J.P., Brandt, E.V., Ferreira, D. (1992). C-H Hetcor NMR Studies of Proanthocyanidins and their Derivatives. In: Hemingway, R.W., Laks, P.E. (eds) Plant Polyphenols. Basic Life Sciences, vol 59. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3476-1_18
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DOI: https://doi.org/10.1007/978-1-4615-3476-1_18
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