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Reactions of O-benzoylated glucopyranosyl halide (I, Br), isolated or generated in situ from per-benzoylated glucose (8a) and trimethylsilyl halide, with various alcohols were efficiently promoted by zinc halide (Cl, Br) or N-bromosuccinimide with a catalytic ZnI 2 to give the corresponding 1,2-trans-β-glucosides in good to high yields. When the anomeric halogenation of 8a was carried out...
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