FIELD: organic chemistry. SUBSTANCE: (C2H5O)2P(O)C(O)OC2H5 is used as reagent 1, aqueous solution of NaOH being used as reagent 2. Reaction is carried out by heating of reaction mixture to 50 C followed by sustaining of reaction mixture by boiling. Then reaction mixture is cooled to temperature lower than 17 C, desired product is isolated and recrystallized. The latter process takes place by cooling of aqueous solution of raw product to 20 C or by cooling to 5 C followed by drying thus prepared dodecahydrate of trisodium phosphonoformiate. EFFECT: improves efficiency of the method.
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