But-3-enylboronic acid is primarily used in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions. This reaction is widely employed to form carbon-carbon bonds, making it valuable in the production of pharmaceuticals, agrochemicals, and advanced materials. Its vinyl group allows for further functionalization, enabling the creation of complex organic molecules. Additionally, it serves as a key intermediate in the synthesis of bioactive compounds and polymers, contributing to the development of new drugs and innovative materials. Its versatility and reactivity make it a crucial component in modern synthetic chemistry.