sugar is an epimer of D-mannose? only one chiral different a) D-galactose b) D-allose c) D-talose d) L-mannose This sugar is (use structures from 6) OH OH HO OH OH H a) a-(D)-mannopyranose b) ẞ-(D)-mannopyranose c) B-(D)-galactopyranose d) B-(D)-talopyranose d) a-(D)-allopyranose
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- Lactose is a disaccharide in which a glycosidic linkage connects the monosaccharides galactose and glucose. OH НО OH (a) Identify the glycosidic linkage and the acetal carbon in lactose. (b) What type of glycosidic linkage does lactose have (i.e., is it 1,1'-, 1,2'-, etc., and is it a or B)? (c) People who are lactose intolerant are deficient in the enzyme lactase, and therefore cannot efficiently break down the disaccharide into its monosaccharides. When lactose is treated with aqueous acid, however, this hydrolysis can take place, though relatively slowly. Draw the complete, detailed mechanism and the products of the acid-catalyzed hydrolysis of lactose. Но ОН НО ОН ОН Lactose) Draw d-allose, the C3 epimer of glucoseCompound A is a D-aldopentose that can be oxidized to an optically inactive aldaric acid B. On Kiliani-Fischer chain extension, A is converted into C and D; C can be oxidized to an optically active aldaric acid E, but D is oxidized to an optically inactive aldaric acid F. What is the structure of compound F? • Use the wedge/hash bond tools to indicate stereochemistry where it exists. You do not have to explicitly draw H atoms. If a group is achiral, do not use wedged or hashed bonds on it. • Show stereochemistry in a meso compound. • Do not include lone pairs in your answer. They will not be considered in the grading.
- The anticoagulant heparin is a polysaccharide that contains alternating residues of -D- glucuronic acid-6- sulfate and N-sulfo-D-glucosamine-6sulfate connected by (1 B 4)- glycosidic linkages. Draw a part of heparin that shows one each of the two residues.Draw the following monosaccharides, using chair conformations for the pyranoses andHaworth projections for the furanoses.(a) a-d-mannopyranose (C2 epimer of glucose)(b) b-d-galactopyranose (C4 epimer of glucose)(c) b-d-allopyranose (C3 epimer of glucose)(d) a-d-arabinofuranose(e) b-d-ribofuranose (C2 epimer of arabinose)a) Draw structural formulas for the two monosaccharides that result when structure III istreated as shown below. (b) Draw the monosaccharide that results when product A from the previous step (Q1a) istreated with Br2/H2O. (c) Draw the monosaccharide that results when product A from the previous step (Q1a) istreated with 1.NaBH4 / 2. H2O.
- Which of the following monosaccharides gives optically inactive alditols on reduction with D-Glucose; L-Galactose D-Allose; D-Galactose L-Talose; D-Allose D-Altrose; D-Galactose NaBH,Provide suitable responses for questions (a) –(j).| 6 CH2OH 4 ОН OH OH 2.*22) Draw the Fischer projection and Hayworth formula for D-galactose - the C4 epimer of D- glucose. (Okay to skip this for discussion with molecular models in lab.) Fischer projection of D-galactose Hayworth formula of a-D-galactose Reactions and Disaccharides 23) Aldehydes are oxidized to: 24) Open-chain aldoses can be oxidized, so they are called 'reducing sugars'. When D-glucose is oxidized, what is the carboxylic acid formed? 25) Can the hemiacetal be oxidized? 25) Can a ketose be oxidized? CHM60 Lecture Worksheet: Carbohydrates J 5 2
- 6:18 D-fructose Linear formDraw the following monosaccharides, using chair conformations for the pyranoses andHaworth projections for the furanoses.(a) a-d-mannopyranose (C2 epimer of glucose)Two sugars are epimers to each other. Is it possible to convert one to the other without breaking covalent bond??SEE MORE QUESTIONS
