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13C NMR spectra of some sulphur dioxide—aromatic amine complexes

The 13C NMR spectra of equilibrium mixtures formed between sulphur dioxide and N‐methylbenzenamine, N,N‐dimethylbenzenamine and N,N‐diethylbenzenamine were obtained. The analysis of the spectral data indicates that the interaction of the amines with the Lewis acid occurs by means of the lone pair mainly localized on the nitrogen atom, and that the complexes can be considered as labile on the time scale of the experiment.