The cis-trans isomerism of N-methylformamide has been reexamined by IR and NMR spectroscopic methods with the help of relatively high level DFT calculation. The occurrence of the cis-form in the amide molecule has been verified undoubtedly and the abundance of the cis-form as a minor component was d
✦ LIBER ✦
Solution behavior of methyl β-xylobioside: Conformational flexibility revealed by n.m.r. measurements and theoretical calculations
✍ Scribed by Miloš Hricovíni; Igor Tvaroška; Ján Hirsch
- Book ID
- 107726018
- Publisher
- Elsevier Science
- Year
- 1990
- Tongue
- English
- Weight
- 794 KB
- Volume
- 198
- Category
- Article
- ISSN
- 0008-6215
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The conformations of the (1----4)-linked alpha-D-galacturono-di- (1) and -tri-saccharide (2) in aqueous solutions have been analysed by n.m.r. spectroscopy and MM2CARB calculations. The 3JC.H. and n.O.e. values did not change with temperature and were comparable for 1 and 2. Four energy regions were