Characterization of polyphenols from plant materials through their silylation and 29Si NMR spectroscopy—line assignment through 29Si, 13C spin–spin couplings
✍ Scribed by Jan Schraml; Vratislav Blechta; Jan Sýkora; Ludmila Soukupová; Petra Cuřínová; David Proněk; Jaromír Lachman
- Publisher
- John Wiley and Sons
- Year
- 2005
- Tongue
- English
- Weight
- 134 KB
- Volume
- 43
- Category
- Article
- ISSN
- 0749-1581
- DOI
- 10.1002/mrc.1638
No coin nor oath required. For personal study only.
✦ Synopsis
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.