Used as a key intermediate in the synthesis of quinoline-based pharmaceuticals, particularly in the development of antimalarial and anticancer agents. Its aldehyde and chlorine functionalities allow for selective chemical modifications, enabling the construction of complex heterocyclic systems. Commonly employed in condensation and coupling reactions to form imines, hydrazones, or extended conjugated structures for bioactive molecule design. Also utilized in agrochemical research for developing novel pesticides with improved efficacy and selectivity.