13C NMR spectra of pyridinium betaines and related compounds
- 1 January 1976
- journal article
- research article
- Published by Wiley in Magnetic Resonance in Chemistry
- Vol. 8 (1), 21-27
- https://doi.org/10.1002/mrc.1270080107
Abstract
13C NMR spectra of 1‐methyl‐, 1‐phenyl‐ and 1, 6‐dimethyl‐pyridinium‐3‐oxide, 3‐methylphthalazinium 1‐oxide and anhydro‐3‐methanesulphonamido‐1‐methylpyridinium hydroxide, together with the corresponding amines and quaternary salts, were determined with and without proton noise‐decoupling. The assignment of resonances was based on the analysis of the fine splitting pattern caused by long range couplings whenever appropriate. A procedure for the estimation of chemical shifts of the salts and betaines is proposed.Keywords
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