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hemiketal

Pronunciation: hem'e-ke'tal

Definition: 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

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© Copyright 2017 Wolters Kluwer. All Rights Reserved. Review Date: Sep 19, 2016.
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