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Intramolecular anhydrides sugars

The reactivity of the 2,5-anhydrides of aldoses is determined by two essential structural features that do not exist in the sugars, namely, the presence of an oxolane ring and of a carbonyl group (most frequently, free) a to the ring-oxygen atom. These two characteristics make the 2,5-anhydroaldoses closer to tetrahydro-2-furaldehyde than to the aldoses, where only in exceptional cases is the carbonyl group not masked by the formation of an intramolecular, five- or six-membered, hemiacetal ring. [Pg.210]

Sugar anhydrides internal acetals formed by intramolecular removal of water from a sugar molecule. They are chemically similar to glycosides and can be hydrolysed to the corresponding sugars by water or (Uute acids. [Pg.653]

In addition to extramolecular condensation to homoglycosides, aldohexoses also undergo intramolecular condensation of the hemiacetal and other hydroxyl groups to form the corresponding anhydrosugar (sugar anhydride). In addition to the main... [Pg.293]

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Intramolecular anhydrides

Sugar anhydrides

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