Used primarily as an intermediate in organic synthesis, particularly in the pharmaceutical industry for constructing complex molecules. It serves as a building block in the preparation of bioactive compounds, including certain central nervous system agents and serotonin receptor ligands. Its aldehyde functionality allows for condensation and nucleophilic addition reactions, making it valuable in forming carbon-carbon bonds. Also employed in the synthesis of heterocyclic compounds and fragrances due to its aromatic and reactive characteristics.