Used primarily as an intermediate in organic synthesis, especially in the production of pharmaceuticals and agrochemicals. The chlorine substituent at position 6 facilitates subsequent reactions, such as nucleophilic substitution or carbon-carbon bond formation via copper- or palladium-catalyzed couplings. Its structure allows for functionalization at multiple sites, making it valuable in constructing complex indene-based compounds. Commonly employed in the development of specialty polymers and ligands for catalysis. Also explored in research for bioactive molecules due to the indene core’s presence in some pharmacologically active compounds.