4,4-chloroformylphenylene ether, also known as CFPE, is a chemical compound that finds substantial utility in a wide range of industrial applications. It is a yellowish powder with a molecular formula of C8H4Cl2O and a molecular weight of 191.03 g/mol. CFPE is primarily used as a reactive intermediate in various syntheses, enabling the production of high-performance polymers and copolymers.