Used as a key intermediate in the synthesis of advanced organic semiconductors and optoelectronic materials. Its rigid spirocyclic framework enhances thermal stability and electron-donating properties, making it suitable for applications in organic light-emitting diodes (OLEDs) and perovskite solar cells. Also explored in the development of fluorescent probes and sensors due to its strong nitrogen-rich structure and conjugated system, which support efficient charge transfer and luminescence.