Ethylhydrazine dihydrochloride is primarily used in organic synthesis as a reagent for the preparation of various chemical compounds. It is particularly valuable in the synthesis of heterocyclic compounds, which are essential in the development of pharmaceuticals and agrochemicals. The compound is also employed in the production of hydrazine derivatives, which serve as intermediates in the manufacture of dyes, antioxidants, and corrosion inhibitors. Additionally, it finds application in research laboratories for the study of chemical reactions involving hydrazine-based compounds. Its role in these processes underscores its importance in advancing chemical and pharmaceutical industries.