Concept explainers
(a)
Interpretation: The enantiomer of D-fructose is to be drawn.
Concept introduction: A sugar molecule in which hydroxyl group of second last carbon atom is on the left and right side of the horizontal line is known as
(b)
Interpretation: An epimer of D-fructose at
Concept introduction: Two compounds which are neither superimposable nor mirror images to each other and the configuration of one of their stereogenic centers is different are known as epimers.
(c)
Interpretation: An epimer of D-fructose at
Concept introduction: Two compounds which are neither superimposable nor mirror images to each other and the configuration of one of their stereogenic centers is different are known as epimers.
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- m) Which pyranose ring (A, B, C, or D) in the tetrasaccharide below is derived from D-altrose? The Fischer projections for the four aldohexoses that make up this tetrasaccharide are shown below. B C D HOH CHO CHO CHO CHO HO+H HTOH Fонно н HOH HOH H-OH H-OH H-+-OH H-TOHHOH HOH H+OH HOHнтон нон CHOH CHOH CHOH CHOH De D-glue Dalose Datrone i NH Į HOH STEP 1 OH, HO- answer 1. Just add arrows and charges for steps 1, 2, and 3 in formation of this enamine з no arrows needed here OH н Н ЮН -OH STEP 3 :ÖH н H STEP 2 на это про за почarrow_forwardPsicose is the C3 epimer of fructose. Draw a Fischer projection of L-psicose. Q4. Draw a chair conformation of L-psicopyranose. Q5. Draw and provide names for the two possible anomers of the furanose form of D-ribulose. CH,OH -HO- -OH ČHHOH D-ribulosearrow_forwardFor D-arabinose:a. Draw its enantiomer.b. Draw an epimer at C3.c. Draw a diastereomer that is not an epimer.d. Draw a constitutional isomer that still contains a carbonyl group.arrow_forward
- What sugar is the C-3 epimer of d-xylose? . What sugar is the C-5 epimer of d-allose? What sugar is the C-4 epimer of l-gulose? d. What sugar is the C-4 epimer of d-lyxose?arrow_forwardi need an answer pleaseeeearrow_forwardWhich one is b-D glucose and which one is a-L glucose ? 2. Which one is b-fructose and which a-L fructose?arrow_forward
- Draw the product formed when each monosaccharide is oxidized with Benedict’s reagent.arrow_forward9 A disaccharide consists of the molecules of D-glucose and D-glucosamine joined by a (1a, 1b)-glucosidic bond. a) Draw the structure of the disaccharide (Haworth projection) if you know that in D- glucose the anomeric carbon has an a-configuration. b) Give the name of the union you drew in question a. c) Draw the structure of the product (cantilever conformation) resulting from the effect of excess acetic anhydride and pyridine on the disaccharide. Hint: D-glucosamine has the same structure as D-glucose, but C-2 has an amino group instead of a hydroxyl.arrow_forward5-Deoxyglucose will close to a?arrow_forward
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