| 摘要 |
PURPOSE:To obtain industrially and advantageously D-ribose useful as a synthetic raw material for vitamin B2, by the presence of a boric acid compound in a solution containing D-arabinose in epimerizing the solution in the presence of molybdic acid ions as a catalyst. CONSTITUTION:D-Arabinose is dissolved in a solvent, e.g. ethanol, in an amount of preferably 0.5-3 times (wt./vol.) of that of the D-arabinose, and molybdic acid ions, e.g. ammonium molybdate as a catalyst, and a boric acid compound, preferably boric acid, in a molar amount of preferably 1.5-3 times of that of the D-arabinose are added to the solution. The resultant mixture is then react- ed preferably at 90-95 deg.C for 30-60min to epimerize the D-arabinose and give the aimed solution containing D-ribose.
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