Phenoxathiin-4-ylboronic acid is primarily utilized in organic synthesis, particularly in cross-coupling reactions. It serves as a key building block in the formation of complex organic molecules, often used in the synthesis of pharmaceuticals and agrochemicals. Its boronic acid group enables efficient Suzuki-Miyaura coupling, a widely employed method for creating carbon-carbon bonds. This compound is also valuable in the development of advanced materials, including polymers and liquid crystals, due to its ability to introduce specific functional groups into molecular structures. Additionally, it finds application in the preparation of ligands for catalytic systems, enhancing the efficiency of various chemical transformations.