sec-Butylhydrazine dihydrochloride is primarily used in organic synthesis as a building block for the preparation of various chemical compounds. It is particularly valuable in the synthesis of hydrazine derivatives, which are often employed in the production of pharmaceuticals, agrochemicals, and specialty chemicals. The compound serves as a key intermediate in the development of active pharmaceutical ingredients (APIs), where it can be utilized to introduce hydrazine functionalities into target molecules. Additionally, it finds application in the synthesis of dyes, pigments, and other fine chemicals, where its reactivity and structural properties are leveraged to achieve specific chemical transformations. In research settings, it is also used as a reagent for studying reaction mechanisms and developing new synthetic methodologies.