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Solvent effects in nuclear magnetic resonance spectra of some pyrazines, pyrimidines and their N-oxides

✍ Scribed by William W. Paudler; Sharon A. Humphrey

Publisher
John Wiley and Sons
Year
1971
Tongue
English
Weight
195 KB
Volume
3
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The benzene‐induced solvent effects upon the proton chemical shifts of various pyrazines, pyrimidines and their N‐oxides are described. Larger chemical shift effects, implying closer benzeneheterocycle association, are noted in the N‐oxides as compared to the non‐oxidized heterocycles.

The solvent‐induced chemical shift changes can be used to establish the site of N‐oxidation in those instances where different isomers can be formed.

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