Abstract
3,4,5,6-Tetrahydro-2-aminopyridine reacts with bis-imidoylchlorides derived from oxalic acid to yield new dimeric tetraazafulvadienes. Ketene aminals could be isolated and characterized as key intermediates in a cascade reaction (cyclization–prototropism–oxidation–dimerization–deprotonation). The stable tetraazafulvadienes have been transformed with boron compounds into highly fluorescent tricyclic diazaborolidines.
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