Used primarily as a building block in organic synthesis, especially in the production of conjugated polymers for organic electronics such as organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). Its ethynyl group enables coupling reactions like Sonogashira, allowing for extension of π-conjugated systems. The methylthiophene moiety enhances electron-rich character, improving charge transport properties in semiconductor materials. Also investigated in the synthesis of novel copolymers for light-emitting diodes (OLEDs) and sensors due to its favorable electronic and structural properties.