Thianthren-2-ylboronic acid is primarily used in organic synthesis, particularly in cross-coupling reactions like the Suzuki-Miyaura reaction. This reaction is widely employed to form carbon-carbon bonds, making it valuable in the synthesis of complex organic molecules, including pharmaceuticals, agrochemicals, and advanced materials. The compound acts as a key intermediate, enabling the introduction of the thianthrene moiety into target molecules, which can impart unique electronic or structural properties. Its application is also explored in the development of organic semiconductors and optoelectronic materials due to the thianthrene group's potential to influence charge transport and light absorption characteristics. Additionally, it may be utilized in the preparation of ligands for catalysis or in the design of molecular probes for biochemical studies.