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Report | Regular issue | Vol 20, No. 2, 1983, pp.239-246
Published online, 1st January, 1970
DOI: 10.3987/R-1983-02-0239
13C-NMR Quanternisation Shift Increments for 3-Substituted Pyridines in N-Banzyl- and N-2,4-Dinitrophenyl-pyridinium Salts

Roger Dommisse, Eddy Freyne, Josef Lepoivre, and Frank Alderweireldt

*Labratory of Organic Chemistryn University of Antwerp (RUCA), Groenenborgerlaan 171, B-2020 Antwerp, Belgium

Abstract

The 13C-NMR spectra of a series of 3-substituted and 3,5-disubstituted pyridinium salts are examined. It appears that quaternisation shift increments have to be used with care because of their dependence on the pyridine substituents present, the N-alkyl- or N-aryl group and the experimental conditions (e. g. solvent, concentration, counter ion . . . ) .