The X-ray crystal structure of the title compound, (3), reveals a close intramolecular contact between the polar methine hydrogen and amino nitrogen atoms of 2.34(3)Å, consistent with the hydrogen bonding interaction detected in solution by 1H n.m.r. spectroscopy.
R. L. Harlow, C. Li and M. P. Sammes, J. Chem. Soc., Chem. Commun., 1984, 818 DOI: 10.1039/C39840000818
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