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How dangke desulfurization manufacturing
How dangke desulfurization manufacturing
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机译：how党课desulfurization manufacturing
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摘要
PURPOSE:To obtain industrially and advantageously a sugar ketal useful for protecting OH and a synthetic intermediate, by reacting a sugar with a ketone in the presence of antimony pentachloride or pentafluoride. CONSTITUTION:A sugar, e.g. D-arabinose, is reacted with a ketone, e.g. acetone, in a molar amount of 2-10 times of the theoretical amount, in the presence of preferably 0.05-5wt%, based on the sugar, antimony pentachloride or antimony pentafluoride preferably at 20-100 deg.C for 1-8hr. In the process, an inert solvent or the above-mentioned ketone is used as a solvent. The reaction solvent is then distilled away to afford the aimed sugar ketal, e.g. 1,2:3,4-di-O-isopropylidene-beta-D-arabinopyranose.
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