BackCellulose is converted to cellulose acetate by treatment with acetic anhydride and pyridine. Cellulose acetate is soluble in common organic solvents, and it is easily dissolved and spun into fibers. Show the structure of cellulose acetate.
Which disaccharide is composed of and joined by a glycosidic bond?
Which of the following molecules is a disaccharide?
How many sugar units are bonded together in a ?
b. Identify the glycosidic linkage that connects the sugars.
What type of bond is formed between two sugars in a disaccharide?
Draw the structures of the individual mutarotating α and β anomers of maltose.
Which of the following sugar molecules are commonly found in disaccharides?
Which type of bond is responsible for the formation of disaccharides?
Disaccharides are composed of how many covalently-bonded simple sugars?
Which of the following molecules consists of two monosaccharides bonded together?
Give an equation to show the reduction of Tollens reagent by maltose.
Trehalose, C12H22O11, is a nonreducing sugar that is only 45% as sweet as sugar. When hydrolyzed by aqueous acid or the enzyme maltase, it forms only D-glucose. When it is treated with excess methyl iodide in the presence of Ag2O and then hydrolyzed with water under acidic conditions, only 2,3,4,6-tetra-O-methyl-d-glucose is formed. Draw the structure of trehalose.
Draw a theoretical acid-catalyzed Fischer Glycosidation mechanism for the condensation of D-Glucose into cellubiose. (Note:This reaction would lead to very poor yields of cellubiose- can you hypothesize why?)
Draw the structures (using chair conformations of pyranoses) of the following disaccharides.
(a) 4-O-(α-D-glucopyranosyl)-D-galactopyranose
(b) α-D-fructofuranosyl-β-D-mannopyranoside
(c) 6-O-(β-D-galactopyranosyl)-D-glucopyranose