Chapter 28, Problem 28.68P

Interpretation Introduction

(a)

Interpretation: The structure of polysaccharide formed by joining D-glucosamine in $1\to 6$-$\text{α}$-glycosidic linkage is to be drawn.

Concept introduction: Monosaccharides are the small units of simple sugars. Disaccharides are formed by two units of monosaccharides. Polysaccharides are made up of small units of monosaccharides. These small units are joined together by glycoside linkage.

Interpretation Introduction

(b)

Interpretation: The structure of disaccharide formed by joining D-mannose and D-glucose in $1\to 4$-$\text{β}$-glycosidic linkage using mannose’s anomeric carbon is to be drawn.

Concept introduction: Monosaccharides are the small units of simple sugars. Disaccharides are formed by two units of monosaccharides. Polysaccharides are made up of small units of monosaccharides. These small units are joined together by glycoside linkage.

Interpretation Introduction

(c)

Interpretation: The structure of α-$N$-glycoside formed from D-arabinose and ${\text{C}}_{\text{6}}{\text{H}}_{\text{5}}{\text{CH}}_{\text{2}}{\text{NH}}_{\text{2}}$ is to be drawn.

Concept introduction: The α-$N$-glycoside linkages are formed between the amines and hydroxyl group present on the axial position in presence of mild acids.

Interpretation Introduction

(d)

Interpretation: The structure of ribonucleoside formed from D-ribose and thymine is to be drawn.

Concept introduction: The α-$N$-glycoside linkages are formed between the amines and hydroxyl group present on the axial position in presence of mild acids. The ribonucleoside contains α-$N$-glycoside linkages between D-ribose and deoxy-ribose and bases such as purine, thymine, pyrimidine.