Chapter 20, Problem 60P

Interpretation Introduction

Interpretation:

The structure of a disaccharide formed from mannose units joined by a 1→4-a-glycosidic linkage should be drawn.

Concept Introduction:

Disaccharides are carbohydrates composed of two monosaccharides. Disaccharides are acetals, compounds that contain two alkoxy groups (OR groups) bonded to the same carbon.

The reaction between two monosaccharides such that hemiacetal of one reacts with hydroxyl of second, results in the formation of acetal group.

The new C-O bond that joins the two rings called a glycosidic linkage.

There may be five-membered or six-membered rings in the two monosaccharide. In all the disaccharides there is at least one acetal that joins the rings together. Each ring is numbered beginning at the anomeric carbon, the carbon in each ring bonded to two oxygen atoms