hydrazine, 2-aminopyridine, and 2,6-diaminopyridine are used to form the chelating ligands in 1, 6, and 8, respectively, while carbonyl compounds-biacetyl, pyridine-2-aldehyde, and 2,6-diacetylpyridine-are used to form the analogous ligands of compounds 16, 17,17 and 18.26 Clearly a number of other chelating ligands may be obtained from the amine-isocyanide reaction, but it remains to be seen if such ligands may be constructed (26)
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