A disaccharide consists of the molecules of D-glucose and D-glucosamine joined by (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.

Organic Chemistry
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Chapter25: Carbohydrates
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9
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.
Transcribed Image Text:9 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.
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