A method of preparing a dialkyl phosphinate

The present invention discloses a method of chemical synthesis, particularly refers to a process for the preparation of a dialkyl phosphinate. The present invention hypophosphorous acid and / or alkali metal salts of hypophosphorous acid as the starting material, the reaction was added a small amount of additives dissolved in water, then transferred to the autoclave, after nitrogen substitution heating temperature, into an olefin, and then adding the initiator, the reaction to give dialkylphosphinic acids and / or alkali metal salts of dialkyl phosphinic acid; then the dialkylphosphinic acids and / or alkali metal salts of dialkyl phosphinic acid into a reactor, heated to after a certain temperature, was slowly added dropwise a solution of a metal salt, to give the corresponding dialkyl phosphinate precipitate was then filtered, washed, and dried to give a dialkyl phosphinate products. Advantages of the present invention is used as a reaction solvent system of water, the reaction by the addition of certain auxiliaries and initiator feed mode change, reducing the reaction temperature, reaction time is shortened, improving the product yield and product quality, cost savings.