hemiketal


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hem·i·ke·tal

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

hem·i·ke·tal

(hem'ē-kē'tăl)
A product of the addition of an alcohol to a ketone. In the ketose sugars, the hemiketal formation is from an attack by an internal OH on the ketone carbonyl leading to intramolecular cyclization (furanose or pyranose); the hemiketal forms of the sugars are involved in polysaccharide formation, as glycosyls or glycosides.
See also: hemiacetal, ketal