Sugar acetates, acid-catalyzed anomerization

This process is the main course for the acid-catalyzed anomerization of sugar acetates, methyl glycosides, and related compounds in non-aqueous solvents.104,244,245 260,263 In many instances, formation of the cyclic carbonium ion is assisted by participation of a neighboring acetyl group,104 but this process is not a necessary feature. Anomerization of tetra-O-acetyl-2-deoxy-a-D-arafomo-hexopyranose takes place through a cyclic carbonium ion as depicted.245[Pg.43]

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