Methyl diphenylphosphite is widely used as a key intermediate in the synthesis of various organophosphorus compounds. It plays a significant role in the production of flame retardants, which are essential for enhancing the fire resistance of materials such as plastics, textiles, and electronics. Additionally, it is employed in the manufacturing of pesticides, where it acts as a precursor for creating compounds that protect crops from pests and diseases. In the field of polymer chemistry, it serves as a stabilizer and antioxidant, helping to extend the lifespan of polymers by preventing degradation caused by heat and oxidation. Furthermore, it is utilized in organic synthesis as a reagent for phosphorylation reactions, enabling the modification of molecules to achieve desired chemical properties. Its versatility makes it valuable across multiple industrial applications.