Quantitative relationships between the carbon-13 chemical shift of the carbonyl and methylene carbon atoms of N-phenacylpyridinium bromides and σ+ values for 3- and 4-substituents on the pyridine ring have been found.
A. D. Harsch, S. Johnson and D. W. Boykin, J. Chem. Soc., Chem. Commun., 1977, 119 DOI: 10.1039/C39770000119
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