hemi-acetal

См. также в других словарях:

• Hémi-acétalisation — Acétal et cétal Les acétals sont obtenus par addition nucléophile d un alcool sur un aldéhyde en milieu acide, suivie d une élimination d eau. Les cétals sont obtenus par le même type de réaction effectuée sur les cétones. Voici un exemple… …   Wikipédia en Français

• hemiacetal — hemi·acetal …   English syllables

• hemiacetal — noun an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones • Hypernyms: ↑organic compound * * * | ̷ ̷ ̷ ̷ at hemi + noun Etymology: hemi (I) + acetal : any of a …   Useful english dictionary

• monosaccharide — /mon euh sak euh ruyd , euhr id/, n. Chem. a carbohydrate that does not hydrolyze, as glucose, fructose, or ribose, occurring naturally or obtained by the hydrolysis of glycosides or polysaccharides. Also, monosaccharose /mon euh sak euh rohs /.… …   Universalium

• pyranose — Sugar structure in which the carbonyl carbon is condensed with a hydroxyl group (ie. in a hemi acetal link), forming a ring of five carbons and one oxygen. Most hexoses exist in this form, although in sucrose, fructose is found with the smaller… …   Dictionary of molecular biology

• hemiacetal — /hem ee as i tal /, n. any of the class of organic chemical compounds having the general formula RCH(OH)OR, where R is an organic group. [1890 95; HEMI + ACETAL] * * * …   Universalium

• Hemiacetal — Skeletal formula of a hemiacetal Hem …   Wikipedia

• 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 h.). In the aldose sugars, the h. formation is internal and labile, brought about by the 4 OH or 5 OH attack on the …   Medical dictionary

• Galanthamine total synthesis — ; 2006; 106(1) pp 116 133; (Review) DOI|10.1021/cr040415t] The natural source of galantamine are certain species of daffodil and because these species are scarce and because the isolation of galanthamine from daffodil is expensive (a 1996 figure… …   Wikipedia