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Chap 11 - Chap 11 Assigned sugars Isomers Compounds with...

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Chap 11 Assigned sugars
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Isomers - Compounds with the same composition and molecular weight, but differing structure, used for ketose vs aldose Epimers- differ by arrangement about 1 asymmetric carbon, D-Galactose is the 4-epimer of D-glucose Anomers- differ by configuration about carbonyl carbon, after the formation of acetal, ketal, hemiacetyl or hemiketal ring structure, alpha anomer of D sugar is D and the beta anomer of a D-glucose is L Mutarotation- chemical interconversion of alpha and beta anomers Sugar Alcohol- delete “ose” and” itol” Hemiacetal- has hydroxyl and ether on same carbon, Acetal has 2 ethers, hemiacetals hydrolyze easily, acetals are harder to hydrolyze. Hemiketal and Ketal are parallel. Sugars of 5 or more carbons in solution exist in ring form, hemiacetal , hemiketal Glycosidic Linkage- refers to attachement at the anomeric carbon, formation turns hemiacetal to acetal, stabilizes sugar, only one per sugar Reducing Sugar-
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