## Abstract ^1^H and ^13^C NMR spectra are reported and assigned for imidazo[1,2β__a__] pyrazine and for __N__β1βmethylβ and __N__β7βmethylβimidazo[1,2β__a__] pyrazinium iodides. The effect of protonation on the chemical shifts of the parent molecule is demonstrated, and through the use of ^13^C an
Multinuclear NMR study of protonation in some indolizine systems
β Scribed by Jerzy W. Wiench; Lech Stefaniak; Graham A. Webb
- Publisher
- John Wiley and Sons
- Year
- 1994
- Tongue
- English
- Weight
- 283 KB
- Volume
- 32
- Category
- Article
- ISSN
- 0749-1581
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β¦ Synopsis
Abstract
^1^H, ^13^C and ^15^N NMR data are presented for seven indolizine derivatives in solutions of dimethyl sulphoxide and trifluoroacetic acid (TFA). The TFA solutions contain species protonated at position Nβ1 in all cases. The most definitive evidence for the site of protonation is provided by the ^15^N results.
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