Ethylhydrazine oxalate is primarily utilized in organic synthesis as a versatile reagent. It is commonly employed in the preparation of various heterocyclic compounds, which are essential in the development of pharmaceuticals and agrochemicals. The compound is particularly useful in the synthesis of hydrazine derivatives, which serve as intermediates in the production of drugs targeting conditions like cancer, tuberculosis, and hypertension. Additionally, it is used in the formulation of certain herbicides and pesticides, contributing to crop protection and agricultural efficiency. Its role in chemical research also extends to the study of reaction mechanisms and the development of novel synthetic pathways.