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Two‐dimensional NMR spectra of hydrolysable tannins which form equilibrium mixtures
Author(s) -
Yoshida Takashi,
Hatano Tsutomu,
Okuda Takuo
Publication year - 1992
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260301311
Subject(s) - chemistry , tautomer , two dimensional nuclear magnetic resonance spectroscopy , hemiacetal , proton nmr , molecule , carbon 13 nmr , nuclear magnetic resonance spectroscopy , nmr spectra database , stereochemistry , spectral line , computational chemistry , organic chemistry , physics , astronomy
The structures of hydrolysable tannins, each existing as an equilibrium mixture due to tautomerization at the sugar core(s) or at the dehydrohexahydroxydiphenoyl group (five‐ and six‐membered hemiacetal forms) in the molecule, were elucidated by NMR, employing 2D NMR techniques (COSY, NOESY, 1 H 13 C long‐range COSY, etc.), on derivatives which avoid the spectral complication due to equilibration.