(from the article `chemical compound`) ...but the acid catalyst promotes the replacement of an OH group by an OR group (from a second molecule of alcohol) to give the stable acetals. (If ...
Found on
http://www.britannica.com/eb/a-z/h/35
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: he...
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http://www.encyclo.co.uk/local/20973
Type: Term Pronunciation: hem′ē-kē′tăl Definitions: 1. 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 o...
Found on
http://www.medilexicon.com/medicaldictionary.php?t=39970
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