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Characterization of polyphenols from plant materials through their silylation and 29 Si NMR spectroscopy—line assignment through 29 Si, 13 C spin–spin couplings
Author(s) -
Schraml Jan,
Blechta Vratislav,
Sýkora Jan,
Soukupová Ludmila,
Cuřínová Petra,
Proněk David,
Lachman Jaromír
Publication year - 2005
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.1638
Subject(s) - chemistry , silylation , phenols , polyphenol , carbon 13 nmr , nuclear magnetic resonance spectroscopy , spin (aerodynamics) , carbon fibers , spectroscopy , quercetin , spectral line , computational chemistry , line (geometry) , organic chemistry , stereochemistry , catalysis , materials science , physics , geometry , mathematics , quantum mechanics , astronomy , composite number , engineering , composite material , antioxidant , aerospace engineering
The lines in 29 Si NMR spectra of silylated polyphenols and some other compounds are difficult to assign owing to the absence of couplings with protons outside the silyl group. The assignment can be derived through small n J ( 29 Si, 13 C) couplings ( n > 1). Using a previously described method for measurements of these couplings, the assignment procedure is demonstrated here on three examples of trimethylsilylated phenols: 7‐hydroxyflavone, ferulic acid, and quercetin. In some cases the procedure can be used to identify carbon atoms to which the siloxy groups are attached. Copyright © 2005 John Wiley & Sons, Ltd.