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Betti Bases from 4‐(3‐Pyridazo)‐1‐naphthol: Synthesis, Coordination Behaviour and Unusual Substitution Reactions

A series of Betti bases from 4-(3-pyridyl)azo-1-naphthol dye, possessing flexible methylene or more constrained arylmethyne spaced NH-containing side-chains, were obtained and characterized. It was shown by NMR spectroscopy that the ligands exist in keto form. The products’ structure was confirmed by single crystal XRD of a selected sample. A study on the coordination ability of the ligands with silver(I) was performed, leading to an unexpected substitution reaction.