Synthesis of 2-Hydrazinylpyridine-3,4-dicarbonitriles and Their Reaction with Salicylaldehyde Derivatives

Abstract

2-Chloropyridine-3,4-dicarbonitriles reacted with hydrazine hydrate in ethanol to give 2-hydrazinylpyridine- 3,4-dicarbonitriles. Condensation of the latter with salicylaldehyde and its substituted derivatives afforded the corresponding 2-{2-[2-hydroxyphenylmethylidene]hydrazinyl}pyridine-3,4-dicarbonitriles. The fluorescence spectra of the hydrazones obtained from 3-methoxysalicylaldehyde showed sensitivity toward zinc ions.