Diphenyl carbonate (DPC), with the CAS number 102-09-0, is an organic compound with the chemical formula (C6H5O)2CO. It is a colorless to pale yellow crystalline solid at room temperature. Structurally, it is an ester of carbonic acid and phenol. Its primary and most significant industrial application is as a key monomer in the production of polycarbonate (PC) resins via the non-phosgene melt transesterification process. In this process, DPC reacts with bisphenol-A (BPA) to produce high-molecular-weight, high-purity polycarbonate, which is a vital engineering plastic used in electronics, automotive parts, optical media (CDs/DVDs), and construction materials. This application has largely replaced the older, more hazardous phosgene route. Beyond its role as a polymer precursor, diphenyl carbonate serves as a versatile chemical intermediate in organic synthesis. It acts as a phenylating agent, a carbonyl source, and a reagent for synthesizing other carbonates and urethanes. It is also investigated as a potential electrolyte additive for lithium-ion batteries.