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Alkyl and aryl O-2,3-unsaturated glycosides are important chiral intermediates in carbohydrate chemistry to synthesize new functional materials and compounds with wide range of biological activities,such as oligosaccharides,glycopeptide building blocks,modified carbohydrates,nucleosides,and antibiotics.Besides,the unsaturated part of the sugar ring allows many straightforward modifications such as hydroxylation,oxidation,epoxidation and hydrogenation,which contributes to their diversity and complexity.