C-H Hetcor NMR Studies of Proanthocyanidins and their Derivatives

摘要: Heteronuclear chemical shift correlation NMR experiments are invaluable in the proof of structure and conformations proanthocyanidins their derivatives because power providing evidence for assignment carbon resonances from 1H-NMR spectra or proton 13C-NMR spectra. C-H HETCOR have been essential to conformation two base-catalyzed rearrangement products obtained (+)-catechin polymeric procyanidins. Current work centers on assist definition derivatives. provide first unambiguous assignments both rotameric forms profisetinidin procyanidin dimers with heterocyclic ring coupling constants conformational analysis.