Chapter 22, Problem 2PP

Interpretation Introduction

Interpretation:

The three-dimensional formula for isomer of aldotetrose and ketopentose is to be written and each isomer as D or L sugar is to be designated.

Concept introduction:

Monosaccharides containing 3-carbon atoms are called triose, 4-carbon atoms are called tetrose, 5-carbon atoms are called pentose, and so on.

In chiral molecules, carbon atom having four non-identical substituent groups is called the chirality center of that molecule. Chirality center may also be called stereocenter, which signifies any point in the molecule where the interchanging of any two groups may lead to stereoisomers.

Monosaccharide having its highest chirality center same as that of $\text{D (or +)}-\text{Glyceraldhyde}$ is designated as $\text{D}-\text{Sugar}$, conversely, if the same monosaccharide has its highest chirality center same as that of $\text{L (or }-\text{)}-\text{Glyceraldhyde}$, it is designated as $\text{L}-\text{Sugar}$.