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Nmr spectra of a number of 4‐ N ‐alkylaminoquinolines and 4‐ N ‐alkylaminopyridines show coupling between hydrogen of the amino group and α‐hydrogen on the alkyl group. No such coupling would be observed if the hydrogen were on heterocyclic nitrogen. Other nmr characteristics in the benzenoid region suggest that all simple 4‐aminoquinolines and 4‐aminopyridines have the amino structure.
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Craig et al. (1968) studied this question.
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