2‑Ethylanthraquinone (CAS No. 84‑51‑5; formula C₁₆H₁₂O₂; MW 236.27 g/mol) is a yellowish crystalline powder (melting ~108–111 °C, boiling ~180–190 °C). Insoluble in water, it’s often ≥ 97–98% pure. It functions as a hydrogen peroxide catalyst, dye intermediate, and photoinitiator