Process of preparing 2,2'-(1-Methyl-1,2-Ethanediylidene) bis (Hydrazine carboximidamide)

摘要

The invention concerns a process for preparing 2,2'-(1-methyl-1,2-ethanediylidene)bis[hydrazine carboximidamide] comprising the steps of :a) reacting aminoguanidine hydrochloride with methylglyoxal aldehyde or methylglyoxal dimethyl acetal in an acidic aqueous reaction medium to produce 2,2'-(1-methyl-1,2-ethanediylidene)bis[hydrazine carboximidamide]; andb) purifying the 2,2'-(1-methyl-1,2-ethanediylidene)bis[hydrazine carboximidamide] by recrystallization from an acidic aqueous medium.