U.v. spectroscopy shows that the tautomeric equilibria in N-phenylacetamidine and its p-methoxy- and p-nitroderivatives favour the imino N-aryl tautomers. Basicity measurements indicate pKT 2.4 for N-phenylacetamidine. The basicities of N′-aryl-NN-dimethylacetamidines correlate with σ substituent constants with ρ–3.60.
M. J. Cook, A. R. Katritzky and S. Nadji, J. Chem. Soc., Perkin Trans. 2, 1976, 211 DOI: 10.1039/P29760000211
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