2-keto-L-Gulonic acid → L-Ascorbic Acid

Participants

Reaction Conditions

Reaction Steps

6-O-(2-keto-L-gulonoyl)-L-ascorbate substantially free from 2-keto-L-gulonic acid, 1.2 g (3.4 mmol), was dissolved in 50 ml of water, to which 1.4 g (17 mmol) of sodium hydrogencarbonate was added and stirred at 40° C. for about 1.5 hours. High performance liquid chromatography analysis of the reaction mixture showed that 1.14 g (yield: 95.2%) of L-ascorbic acid was present with 0.07 g of 2-keto-L-gulonic acid but the starting substance 6-O-(2-keto-L-gulonoyl)-L-ascorbate was not found. Condition of high performance liquid chromatography:

Provenance & Evidence