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Reinvestigation of 1H and 13C NMR spectra of 1,8‐bis(dimethylamino)naphthalene complexes with mineral acids

Hydrogen and carbon‐13 NMR chemical shifts of five complexes of 1,8‐bis(dimethylamino)naphthalene with strong acids were measured in acetonitrile‐d3 and nitromethane‐d3 and identified by 2D, NOE difference and long‐range enhanced COSY spectra. The assignments of the resonances corresponding to H‐2,7, H‐4,5, C‐3,6 and C‐4,5 obtained in this study differ from those reported previously.