The nucleophilicaromaticsubstitution for heteroatom through electrochemical oxidation of the intermediate sigma-complexes (Meisenheimercomplexes) in simple nitroaromatic compounds is reported for the first time (NASX process). The studies have been carried out with hydride, cyanide, fluoride, methoxy, and ethanethiolate anions and n-butylamine as a nucleophile, at the cyclic voltammetry (CV) and