FIELD: organic chemistry. SUBSTANCE: products of the formula Q1Q2C[P(O)(OH)2]2 where Q1 and Q2 independently each of other: hydrogen or halogen, or their salts. Reagent 1: compound of the formula Q1Q2C[P(O)(OR)2]2 where R nonbranched or branched C1-C4-alkyl. Reagent 2: water. Reagent 3: HCl. Reaction conditions: aqueous hydrolysis is carried out at boiling in the presence of hydrochloric acid taken at concentration 1.0-5.0% of reaction mixture mass. EFFECT: improved method of synthesis. 4 cl, 1 dwg
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