But-3-yn-1-amine hydrochloride is primarily utilized in organic synthesis as a building block for the creation of more complex chemical structures. It is often employed in the development of pharmaceutical compounds, where its alkyne and amine functional groups enable it to participate in various reactions, such as click chemistry and amide bond formation. Additionally, it serves as a precursor in the synthesis of bioactive molecules, including potential drug candidates targeting neurological disorders or infectious diseases. Its role in the preparation of specialized polymers and materials for industrial applications is also noteworthy, particularly in fields requiring tailored chemical properties.