Download PDF Opens in a new window. Article suggestions will be shown in a dialog on return to ScienceDirect. ... Please enable JavaScript to use all the features on this page. ... A number of symmetrically 3,5-disubstituted 4-amino-1,2,4-triazoles are quickly prepared by the reaction of aromatic nitriles on hydrazine dihydrochloride in the presence of an excess of hydrazine hydrate in ethylene glycol under microwave irradiation. ... This method allows the synthesis of the ...