Question

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

Short answer

The Fischer projections are-

a.

b.

c.

d.

Step-by-step solution

Part (a) Step 1: Given Information

In a natural molecule, if the -OH bunch is joined to the base chiral focus and it focuses towards the right then the compound is a D-enantiomer.

Part (a) Step 2: Explanation

In the given construction of threose, the - OH bunch is joined to the base chiral focus and it focuses towards the right. Thusly, it's a D-enantiomer

Part (b) Step 1: Given Information

In a natural molecule, if the -OH bunch is joined to the base chiral focus and it focuses towards the right then the compound is a D-enantiomer.

Part (b) Step 2: Explanation

In the given construction of xylulose, the - OH bunch is joined to the base chiral focus and it focuses towards the right. Thusly, it's a D-enantiomer.

Part (c) Step 1: Given Information

In a natural molecule, if the -OH bunch is joined to the base chiral focus and it focuses towards the left then the compound is an L-enantiomer.

Part (c) Step 2: Explanation

In the given design of Mannose, the -OH bunch is connected to the base chiral focus and it focuses towards the left. In this way, it's an L-enantiomer.

Part (d) Step 1: Given Information

In a natural molecule, if the -OH bunch is joined to the base chiral focus and it focuses towards the right then the compound is a D-enantiomer.

Part (d) Step 2: Explanation

In the given construction of allose, the -OH bunch is joined to the base chiral focus and it focuses towards the right. Thusly, it's a D-enantiomer.