Per-O-acylated glycals3 (1,4- or 1,5-anhydro-2-deoxyald-1-enitols, e. g., 9) represent one of the most useful types of carbohydrate derivatives available for various syntheses. The classical method4 for their preparation is the reaction of acetobromo sugars (e. g., 2) with zinc dust in aqueous acetic acid, but the yields are variable and solvolysis products, among others, are formed in side reactions.5
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Somsák et al. (1993) studied this question.
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