Diisopropyl phosphite is primarily used as an intermediate in the synthesis of various organophosphorus compounds. It is widely employed in the production of flame retardants, which are essential in enhancing the fire resistance of materials such as plastics, textiles, and electronics. Additionally, it serves as a key reagent in the preparation of pesticides and herbicides, contributing to effective crop protection and agricultural productivity. In the pharmaceutical industry, it is utilized in the synthesis of certain drugs and active pharmaceutical ingredients (APIs). Its role as a stabilizer and antioxidant in lubricants and polymers also highlights its importance in improving the durability and performance of industrial products. Furthermore, diisopropyl phosphite is used in organic synthesis as a reducing agent and for the introduction of phosphonate groups into molecules, enabling the development of specialized chemicals for research and industrial applications.