13C-nmr spectra of lysozyme obtained at 50.3 MHz using both static and magic-anglespinning-cross-polarization methods are reported at several water contents. The line widths and consequent resolution in the hydrated material is substantially improved over that in the lyophilized protein. The line na
A Structural Investigation by 13C-NMR of the Cyanogenic Glycosides
✍ Scribed by Winfried Hübel; Adolf Nahrstedt; Victor Wray
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 377 KB
- Volume
- 314
- Category
- Article
- ISSN
- 0365-6233
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✦ Synopsis
Abstract
^13^C‐NMR spectra of 20 cyanogenic glycosides have been measured in deuterium oxide. These compounds constitute representative examples of four groups of glycosides, namely the butyronitrile, propionitrile, mandelonitrile and cyclopentenoncyanohydrin glycosides. The well resolved signals in the proton‐decoupled ^13^C‐spectra are assigned and the potential of this method for characterizing and identifying this type of compound is demonstrated. The subtle effects upon the shifts caused by configuration change in the aglycon moiety are demonstrated to be of use in determining absolute configurations.
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On acetylation, shamimin (1) a new flavonol-C-glycoside, furnished the penta-, hepta-and octaacetates, 5, 4 and 2, 3 respectively. Compound 2 hydrolysed into the tetraacetate 6 whereas 3 and 4 converted into 5 at room temperature. 1 H and 13 C NMR assignments are described.
## Abstract ^13^C NMR spectroscopy was used to investigate the structures of a series of pure isomeric cresylic novolak resins. Chemical shifts were measured and assigned, and end groups were distinguished from the central repeat units of the chains. Based on these measurements, the number average
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