Concept explainers
(a)
Interpretation: The more stable chair form of fucose is to be drawn.
Concept introduction: In Fischer projection formula, the horizontal and vertical line represents the bonds that are present above and below the plane, respectively. The verticals bonds are represented as dashed wedge and horizontal bonds as dark wedge. The substituents present “up” and “down” in Haworth projection are represented as up and down bonds in chair conformation.
(b)
Interpretation: Fucose is to be classified as D- or L-monosaccharide.
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
(c)
Interpretation: Two structural features which are unusual in fucose are to be stated.
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
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Organic Chemistry (Looseleaf)
- a) Draw Haworth projections of both - and -anomers of D-fructose. Indicate which carbon is the anomeric carbon.b) Sucrose is a disaccharide made up of a molecule of D-fructose and D-glucose. Draw the structure of sucrose clearly indicating the linkage between the two monosaccharides and its biological significance.c) Tollen’s reagent is a very mild oxidizing agent which normally oxidize aldehydes but not ketones. However, both glucose and fructose give positive results with Tollen’s reagent and are classified as reducing sugars. Explain how fructose can also give positive results with Tollen’s reagent (illustrate using structures).arrow_forwarda. Write the bondline structure of the osazone produced by glucose. b. Identify two monosaccharides that will produce the same osazone as that of glucosearrow_forward
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