Reductions by sodium borohydride and dithionite of four 1-substituted pyridinium salts gave in all cases mixtures of mainly 1,2- and 1,4-dihydropyridines which were analysed by n.m.r. spectroscopy. Palladium–charcoal hydrogenation catalyst isomerised certain reduced pyridines.
R. M. Acheson and G. Paglietti, J. Chem. Soc., Perkin Trans. 1, 1976, 45 DOI: 10.1039/P19760000045
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