Chapter 25.1, Problem 25.1P

Interpretation Introduction

Interpretation:

The Fischer Projections of all 2-ketopentoses has to be drawn and among that D-2-ketopentoses, L-2-ketopentoses and enantiomers has to be identified.

Concept Introduction:

• The two dimensional representations of Carbohydrates is known as Fischer Projections.
• The Ketopentoses contain the formula ${\text{C}}_{\text{5}}{\text{H}}_{\text{10}}{\text{O}}_{\text{5}}$.
• The 2-ketopentose contain ketone group at the second carbon.

D-ketopentose: The penultimate carbon contains $-\text{OH}$ on right side of the structure.  The D stands for Dextrorotatory.

L-ketopentose: The penultimate carbon contains $-\text{OH}$ on left side of the structure.  The L stands for Levorotatory.

Enantiomers: The stereoisomers which are mirror images and are non-superimposable are known as enantiomers.