Question

a. Identify the glycosidic linkage in disaccharide C, classify the glycosidic bond as $\mathbf{\alpha }\mathbf{}\mathbf{or}\mathbf{}\mathbf{\beta }$, and use numbers to designate its location.

b. Identify the lettered compounds in the following reaction.

Short answer

Answer

a. The linkage in disaccharide C is$\mathrm{\alpha }$-1, 5 –glycosidic linkage.

b.

Step-by-step solution

Glycosidic linkage

Bonds created between a sugar molecule or carbohydrate and an –OR group are termed glycosidic bonds.They are frequently observed in carbohydrate molecules like simple sugars and starch

Disaccharide

Some common disaccharides include sucrose and lactose, comprising a molecular formula${\mathbf{C}}_{\mathbf{12}}{\mathbf{H}}_{\mathbf{22}}{\mathbf{O}}_{\mathbf{11}}$ . A double sugar is reduced to two monosaccharides by hydrolysis. The enzyme used in this process is termed a disaccharidase.

Identification of the glycosidic linkage and its classification

a. In compound C, the position of glycosidic linkage is at the $\mathrm{\alpha }$-1,5 position. The glycosidic linkage can be given as:

Identification and classification of glycosidic linkage

b.All the hydroxyl groups are converted to ethers on treating a base and an alkyl halide. The reaction can be given as:

Treatment of the given compound with${\mathrm{CH}}_3\mathrm{I}\mathrm{and}{\mathrm{Ag}}_2\mathrm{O}$

The treatment of the resulting compound generates ${\mathrm{CH}}_3\mathrm{OH}$, compounds E and F along with its anomers. The reaction can be given as:

Generation of compounds E and F