Hemiacetal

Hemiacetals and hemiketals are compounds that are derived from aldehydes and ketones respectively. The Greek word hèmi means half. These compounds are formed by formal addition of an alcohol to the carbonyl group. When the alcohol group is replaced by a second alkoxy group, an acetal or a ketal, respectively, is formed. == Formula and formation =...
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hemiacetal

(from the article `chemical compound`) The open-chain structures shown above exist in equilibrium with cyclic hemiacetal structures. A hemiacetal is a combination of an aldehyde (or a ... The intermediate hemiacetals are no more stable than the corresponding gem-diols, but the acid catalyst promotes the replacement of an OH group by an ...
Found on http://www.britannica.com/eb/a-z/h/35

hemiacetal

RCH(OH)OR', a product of the addition of an alcohol to an aldehyde (an acetal is formed by the addition of an alcohol to a hemiacetal). In the aldose sugars, the hemiacetal formation is internal and labile, brought about by the 4-OH or 5-OH attack on the carbonyl O, yielding the furanose or pyranose structures; the hemiacetal forms of the sugars ar...
Found on http://www.encyclo.co.uk/local/20973

hemiacetal

Type: Term Pronunciation: hem′ē-as′e-tăl Definitions: 1. RCH(OH)OR′, a product of the addition of an alcohol to an aldehyde (an acetal is formed by the addition of an alcohol to a hemiacetal). In the aldose sugars, the hemiacetal formation is internal and labile, brought about by the 4-OH or 5-OH attack on the carbonyl o...
Found on http://www.medilexicon.com/medicaldictionary.php?t=39883

hemiacetal

[n] - an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones
Found on http://www.webdictionary.co.uk/definition.php?query=hemiacetal
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