Used as a key intermediate in Suzuki-Miyaura cross-coupling reactions for the synthesis of conjugated polymers and organic semiconductors. Its boronate ester groups enable efficient carbon-carbon bond formation, making it valuable in the development of organic light-emitting diodes (OLEDs), organic photovoltaics (OPVs), and field-effect transistors (OFETs). The 2-ethylhexyl side chains enhance solubility in organic solvents, facilitating solution-processing techniques essential for large-area electronic devices. Commonly employed in polymerization reactions to introduce fluorene units into donor-acceptor copolymers, contributing to tunable bandgaps and improved charge transport properties.