Q. 13.23 - An Introduction to General, Organic, and Biological Chemistry

Question

Draw the Fischer projection for the other enantiomer of a to d in problem 13.21.

Step-by-Step Solution

Answer

a) In the first example, we have D-Threose and after changing every configuration we get the mirror image, which is L-Threose.

b) In this example we have D-Xylulose, and when we change the absolute configuration of every stereocenter, we get the other enantiomer, L-Xylulose.

c) In this example we have L-Mannose, and changing the absolute configuration of every stereocenter, we get the other enantiomer, D-Mannose.

d) In this example we have D-Allose, and when we change the absolute configuration of every stereocenter, we get L-Allose.

Step 1: Introduction

Carbohydrates are the most abundant class of organic compounds on the planet. Carbohydrates account for approximately 75% of the dry planet's bulk.

Step 2: Explanation of enantiomers

In this problem, we have to draw the Fischer projections for the other enantiomers of the structures given in problem$13.21.$

Step 3: Explanation part(a)

a) In the first example, we have D-Threose and after changing every configuration we get the mirror image, which is L-Threose.

Step 4: Explanation part(b)

b) In this example we have D-Xylulose, and when we change the absolute configuration of every stereocenter, we get the other enantiomer, L-Xylulose.

Step 5: Explanation part(c)

c) In this example we have L-Mannose, and changing the absolute configuration of every stereocenter, we get the other enantiomer, D-Mannose.

Step 6: Explanation part(d)

d) In this example we have D-Allose, and when we change the absolute configuration of every stereocenter, we get L-Allose.