N,N,N-Triethyl-2-hydrazinyl-2-oxoethanaminium chloride is primarily used in organic synthesis as a reagent for the introduction of hydrazine groups into various chemical compounds. It is particularly valuable in the preparation of hydrazone derivatives, which are intermediates in the synthesis of pharmaceuticals, agrochemicals, and dyes. The compound's ability to form stable hydrazone linkages makes it useful in the development of biologically active molecules, including potential drug candidates. Additionally, it is employed in research settings for the modification of polymers and materials, where hydrazine functionalization can impart specific properties such as enhanced reactivity or solubility. Its application in crosslinking reactions also contributes to the development of advanced materials with tailored mechanical and chemical characteristics.