Draw the following sugars using Haworth projections:b. a-D-tagatopyranosea.c.B-D-galactopyranosec. a-L-glucopyranose

a) The Haworth projections structure of β – D – galactopyranose is -

Answered: Draw the following sugars using Haworth…

Pushing Electrons

4th Edition

ISBN:9781133951889

Author:Weeks, Daniel P.

Publisher:Weeks, Daniel P.

Chapter5: Some Reactions From Biochemistry

Section: Chapter Questions

Problem 7EQ

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Draw the structure of the following:a. D/L-glucose & D/L-fructoseb. α/β-D-glucopyranose & α/β-D-fructopyranosec. α/β-D-glucofuranose & α/β-D-fructofuranose
1. Draw Haworth projections of B-D-arabinofuranose and a-L-mannopyranose. 2. Consider the structure of the disaccharide drawn at right: НО `CH2 В ОН (a) Give the names and D/L designation for the two monosaccharides linked together. H,C-O OHO „OH OH А: НО НО A В: ОН (b) In the structure, circle the anomeric carbon of each saccharide. (c) Is each saccharide present in its a or ß anomer? Specify both A and B (d) Would this disaccharide undergo mutarotation? Why or why not? (e) Would this disaccharide react with Tollens and/or Benedicts reagent? Why or why not? (f) There are two reasons this is very unlikely to be a naturally occurring disaccharide. What about its structure suggests this is true? Give both reasons.
Answer the following questions about monosaccharide B.a. Draw the β anomer of B in a Haworth projection.b. Draw the α anomer of B in a three-dimensional representation using a chair conformation.c. What products are formed when B undergoes the Kiliani–Fischer synthesis?d. What product is formed when B is treated with NaBH4 in CH3OH?e. Draw the disaccharide formed when two molecules of B are joined by a 1→4-β-glycosidic linkage.
Which one is b-D glucose and which one is a-L glucose ? 2. Which one is b-fructose and which a-L fructose?
D-Arabinose can exist in both pyranose and furanose forms. a. Draw the α and β anomers of D-arabinofuranose. b. Draw the α and β anomers of D-arabinopyranose.
a. Draw a three-dimensional structure for the following steroid. b. What is the structure of the single stereoisomer formed by reduction of this ketone wrth H2, Pd-C? Explain why only one stereoisomer is formed.
Draw the products formed when cholesterol is treated with each reagent. Indicate the stereochemistry around anystereogenic centers in the product.a. CH3COCIb. H2, Pd-Cc. PCCd. leic acid, H+e. [1] BH3 ·THF; [2] H2O2, -OH
Which pairs of molecules are interconvertible via mutarotation? O a. D-glucose and D-fructose O b. D-glucose and D-galactose O c. D-glucose and D-glucosamine O d. a-D-glucose and B-D-glucose
Draw the products formed when B-D-galactose is treated with each reagent. a. Ag,0 + CH3I b. NaH + CgHsCH2CI c. The product in (b), then H30* d. Ac20 + pyridine e. CeHsCOCI + pyridine f. The product in (c), then CgHsCOCI + pyridine
(d) Draw the structure of the expected product when monosaccharide B undergo mutarotation upon dissolving in water in the presence of Tollens reagent (AGNO3, NHẠOH). он OH O. OH OH OH monosaccharide B
7. Draw the Haworth structure for the following monosaccharides a. H НО H c=0 H + но - н 3 4 Н 5 - ОН - OH 애 CH₂OH 6 D-Mannose b. H 0 = с H - C - OH HO-C - H H - C - OH H - C - ОН CH₂OH Glucose
Guar gum is a complex polysaccharide used by the food industry as a stabilizer in salad dressings, ice cream and cream cheese. HO HO- OH linkage A sugar chain HO- 11 OH OH 0. HO n HO sugar off the chain OH o O linkage B HO- OH HO- O a. Linkage A is 1,5 a glycosidic linkage O b. Linkage A is 1,4 a glycosidic linkage O c. Linkage A is 1,5 ß glycosidic linkage O d. Linkage A is 1,4 ß glycosidic linkage of m

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Draw the following sugars using Haworth projections: b. a-D-tagatopyranose a. c. B-D-galactopyranose c. a-L-glucopyranose