hemiketal (hem´e-ke-tal)

RC(R´)(OH)OR", a product of the addition of an alcohol to a ketone. In the ketose sugars, the h. formation is from an attack by an internal OH on the ketone carbonyl leading to intramolecular cyclization (furanose or pyranose); the h. forms of the sugars are involved in polysaccharide formation, as glycosyls or glycosides. See also hemiacetal, ketal.


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