FIELD: organic chemistry. SUBSTANCE: product - diethylmaleate. Reagent 1: maleic anhydride. Reagent 2: ethanol. Reaction conditions: initial solution containing 2-40 mole % monoethylmaleate at molar ratio of diethylmaleate and monoethylmaleate (2,3-49): 1, under pressure 0,03-0,33 atm. EFFECT: improved method of purification. 5 dwg, 4 tbl
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