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ChemicalBook CAS DataBase List L-xylose
609-06-3

L-xylose synthesis

8synthesis methods
L-Xylose can be produced from L-xylulose by isomerization. This can be achieved either enzymatically or chemically under alkaline conditions. The equilibrium of the reaction between D-xylose and D-xylulose in an aqueous solution has been determined at pH 6.8-7.4 and at 25 °C to be 85:15 in favor of D-xylose (Tewari et al., 1985).
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Yield:609-06-3 92%

Reaction Conditions:

with sodium ethanolate at 20 - 30;

Steps:

7 Example 7

Compound 9 (10.0 g, 31.42 mmol) was dissolved in 30% sodium ethoxide solution (22.7 g, 126.3 mmol), and the mixture was stirred at 20-30 degrees for 2-5 hours, after concentrating the reaction solution, 30 ml of dichloromethane was added, ρΗ=7 was adjusted with 3N hydrochloric acid, the organic phase was separated and the aqueous phase was extracted three times with dichloromethane, dried the organic phase with anhydrous sodium sulfate, after separation of the solid, the organic phase was concentrated to give white crystals L-xylose (4.4 g, yield 92%);

References:

CN108752396,2018,A Location in patent:Paragraph 0068-0070

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