Fractionation of humic acids by clay minerals assayed by13C-NMR spectroscopy
β Scribed by T. V. Alekseeva; B. N. Zolotareva; Yu. G. Kolyagin
- Book ID
- 110159780
- Publisher
- Springer
- Year
- 2010
- Tongue
- English
- Weight
- 193 KB
- Volume
- 434
- Category
- Article
- ISSN
- 0012-4966
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## Abstract ^13^C shifts are reported for diastereomers with halogen, oxygen and amino substituents which are mainly at vicinal chiral centres. The conformer populations underlying the ^13^C shift analysis can be verified by chemical means, such as change of temperature, solvent polarity (with diha
Oxazolidine derivatives of p-amino alcohols such as ephedrine have been resolved by -C NMR spedroscopy using Eu(hfc), as a chiral shift reagent. The method is quantitative in the determination of enantiomeric excess, and is advantageous where 'H NMR is of limited use owing, for example, to signitica