| 释义 |
hemiacetal
hemiacetal (ˌhɛmɪəˈsiːtæl) nany of a class of compounds derived from aldehydes by adding an alcohol to the carbonyl groupThesaurus| Noun | 1. | hemiacetal - an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketonesorganic compound - any compound of carbon and another element or a radical |
hemiacetal
hemiacetal[¦he·mē′as·ə‚tal] (organic chemistry) A class of compounds that have the grouping 〉C(OH)‒(OR) and that result from the reaction of an aldehyde and alcohol. hemiacetal
hem·i·ac·e·tal (hem'ē-as'e-tăl), 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 oxygen, thus yielding the furanose or pyranose structures; the hemiacetal forms of the sugars are involved in all polysaccharides, as glycosyl residues or glycosides.
See also: hemiketal, acetal. hem·i·ac·e·tal (hem'ē-as'ĕ-tăl) 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 are involved in all polysaccharides, as glycosyls or glycosides.
See also: hemiketal, acetalhemiacetal
Related to hemiacetal: KetalWords related to hemiacetalnoun an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketonesRelated Words |