CHEM 108 Lecture Notes - Lecture 11: Anomer, Mutarotation, Reducing Sugar
12 Mar 2017
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Mutarotation of alpha- and beta-d-glucose - each anomer converts to the open chain and back again. Although we use a haworth to draw them flat, they are not flat. the heterocyclic chair form of glucose: alpha and beta forms are anomers the anomeric c was the carbonyl c. Sugars with 4 or more carbons will primarily exist in cyclic form: the anomeric carbon is the only one with two o"s directly attached, beta form is on same side of ring as c-6. Monosaccharide derivatives: have functional groups other than hydroxyls, used to build other biomolecules. So far we have learned aldehyde oxidized to form carboxcylic acid aldehyde/ketone reduced to form alcohol. However, in a basic benedict"s solution a rearrangement occurs. A carbohydrate that can undergo oxidation is a reducing sugar. To be a reducing sugar, the sugar has to be able to achieve linear form. Identify the anomeric carbon and be sure there is a oh directly attached.
