FIELD: chemistry.
SUBSTANCE: described is a method of producing L-gluconic acid and salt thereof, which involves treatment of aqueous solution of 6-bromo-6-deoxy-2,3-anhydro-D-manno-1,4-lactone with a base at pH equal to at least 12 and temperature from 45 to 60°C to obtain aqueous solution of L-gluconic acid. The invention also describes methods of producing 6-bromo-6-deoxy-2,3-anhydro-D-manno-1,4-lactone by reacting 2,6-dibromo-2,6-dideoxy-D-mannono-1,4-lactone with a Lewis base in a ketone solvent in the presence of catalytic amounts of water.
EFFECT: methods have high output and are realised with less expenses and without anhydrous solvents.
11 cl, 5 ex
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