Malonic Acid → HCID 86735523, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 29.9 g of N-(4-sulfophenyl)urea potassium salt, 15 g of malonic acid and 200 ml of glacial acetic acid was heated to 60° to 70° C with stirring and 300 ml of acetic anhydride was added dropwise to the mixture. After about 50 ml of the acetic anhydride had been added, the mixture dissolved. After all of the acetic anhydride (300 ml) was added, the temperature of the reaction solution increased to 95° C. The reaction solution was stirred for 4 hours and then condensed under reduced pressure so as to precipitate crystals. 700 ml of ethanol was added to the condensed solution and the crystals were completely precipitated. The precipitated crystals were collected by filtration, washed thoroughly with ethanol and dried by heating under reduced pressure to obtain 34.5 g of crystals. The obtained crystals were recrystallized using a 90% methanol aqueous solution and, thereby, 29.3 g of white crystals was obtained. Melting point: above 300° C. Elemental Analysis:

Provenance & Evidence