Process of preparing 2,2'-(1-methyl-1,2-ethanediylidene)bis{hydrazine carboximidamide}

摘要

Process for the preparation of 2,2'-(1-methyl-1,2-ethanediylidene)bisÄhydrazine carboximidamideÜ by a) removing impurities from aminoguanidine bicarbonate ; b) reacting the aminoguanidine bicarbonate with methylglyoxal dimethyl acetal in an aqueous isopropyl medium ; and c) purifying the obtained 2,2'-(1-methyl-1,2-ethanediylidene)bisÄhydrazine carboximidamideÜ by crystallization from an acidic aqueous-isopropanol medium.