1,2-Pentadiene is primarily used in organic synthesis as a building block for more complex chemical compounds. It serves as a key intermediate in the production of specialty chemicals, including polymers and resins. Its unique structure allows it to participate in various chemical reactions, such as polymerization and cycloaddition, making it valuable in creating materials with specific properties. Additionally, it is utilized in research and development for exploring new chemical pathways and synthesizing novel organic molecules.