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The identity of the crystalline product formed by the acetylation of a mixture of methyl α- and β-d-glucopyranuronates has been confirmed as being methyl 1,2,3,4-tetra-O-acetyl-β-d-glucopyranuronate (3), which agrees with the assignment from 1 H NMR. The absolute configuration of compound 3 was assigned to agree with the known chirality of the precursor sugar, d-glucono-6,3-lactone.
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