Used in organic synthesis, particularly in Suzuki-Miyaura cross-coupling reactions to form carbon-carbon bonds. It serves as a building block in the development of pharmaceuticals and agrochemicals, where the benzo[b]thiophene scaffold is present in biologically active molecules. Its boronic acid functionality allows for mild and selective coupling with aryl or heteroaryl halides, making it valuable in medicinal chemistry for constructing complex aromatic systems. Also applied in materials science for synthesizing conjugated polymers and organic electronic materials.