3-Chloro-1-butyne is primarily used as a versatile intermediate in organic synthesis. It serves as a building block for the preparation of various organic compounds, including pharmaceuticals, agrochemicals, and specialty chemicals. The presence of both a chlorine atom and a triple bond in its structure allows for selective reactions, such as nucleophilic substitutions or coupling reactions, making it valuable in the development of complex molecules. Additionally, it is employed in research laboratories for studying alkyne chemistry and exploring new synthetic pathways. Its reactivity also makes it useful in the production of polymers and materials with specific properties.