The assignment of some 'H and -C NMR chemical shifts of apigenin have been uncertain and even contradictory. A reinvestigation with recent NMR techniques has led to a new set of =C NMR parameters and confinned the accepted 'H NMR data.
The assignment of signals in the nitrogen NMR spectra of polycyclic diazines
✍ Scribed by M. Witanowski; L. Stefaniak; G. A. Webb
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 237 KB
- Volume
- 16
- Category
- Article
- ISSN
- 0749-1581
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✦ Synopsis
Abstract
^15^N Nitrogen screening data are reported for some polycyclic azines and compared with previous results where available. INDO/S parameterized screening calculations for cinnoline and quinazoline help to decide between alternative nitrogen assignments. Nitrogen solvent shifts of several ppm are reported for all of the molecules studied.
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