A glycosyl halide is a chemical compound consisting of a glycosyl moiety with a halogen atom bonded to the anomeric carbon atom. They comprise the glycosyl fluorides, glycosyl chlorides, glycosyl bromides, and glycosyl iodides. They are important reagents for chemical glycosylation. An example of a glycosylation reaction involving a glycosyl halide is the Koenigs–Knorr reaction discovered in 1901.
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