Used as a key building block in organic electronic materials, particularly in the synthesis of conjugated polymers and small molecules for organic semiconductors. Its ethynyl groups enable coupling reactions to extend π-conjugation, enhancing electron delocalization in materials used for organic field-effect transistors (OFETs) and organic light-emitting diodes (OLEDs). The butoxy side chains improve solubility in organic solvents, facilitating solution processing during device fabrication. Also employed in the development of covalent organic frameworks (COFs) due to its rigid, planar structure and ability to form extended networks through alkyne-based linkages.