[OH-].[Na+].C1C2C(=O)C3C(=CC=CC=3)C(=O)C=2C=CC=1S([O-])(=O)=O.[Na+].OCC([C@H]([C@@H]([C@H](CO)O)O)O)=O.O=O.[O:38]=[C:39]([OH:48])[C@H:40]([C@@H:42]([C@H](CO)O)[OH:43])[OH:41]>O.CO>[C:39]([OH:48])(=[O:38])[CH:40]([CH2:42][OH:43])[OH:41].[C:39]([OH:48])(=[O:38])[CH2:40][OH:41]A reaction vessel containing 5 g NaOH and 0.2 g sodium anthraquinone-2-sulphonate, AMS, Merck Co., in 150 ml of a solution of 80 mass-% of methanol in water, was kept at a temperature of 25° C. L-sorbose, Merck Co., (70 g/130 ml water) and NaOH (32 g/32 ml water) was added batchwise with 15 min intervals while mixing. Oxygen was added to the mixture and the reaction was continued for about 2 h. The major end product was L-xylonic acid, in addition, treonic acid, glyceric acid and glycolic acid were formed, as well as a large amount of formic acid.
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