Used as a key intermediate in the synthesis of conjugated polymers and organic semiconductors, particularly in the development of polythiophene derivatives for electronic devices such as organic field-effect transistors (OFETs) and organic photovoltaics (OPVs). Its aldehyde and ethynyl functional groups allow for versatile coupling reactions, enabling the extension of π-conjugated systems to tune optical and electronic properties. Also employed in the preparation of fluorescent dyes and sensors due to its ability to participate in cyclization and condensation reactions that enhance luminescent behavior. Its rigid structure supports stability and planarity in final compounds, improving charge carrier mobility in thin-film devices.