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Chapter 13: Q. 13. 26 (page 446)

Draw the Fischer projections for D-fructose and L-fructose.

Short Answer

Expert verified

D-Fructose andL-Fructose must be drawn in Fischer projections.

Step by step solution

01

Introduction

  • The penultimate carbon of Dsugars is displayed in a Fischer projection with hydrogen on the left and hydroxyl on the right.
  • The Lsugars will be represented similarly, with hydrogen on the right and hydroxyl on the left.
  • D-Fructose and L-Fructose must be drawn in Fischer projections in this problem.
02

Explanation of D-Fructose andL-Fructose in Fischer projections.

  • Enantiomers are mirror images of each other, hence $D$ and L-Fructose are mirror images of each other.
  • D-fructose is a ketohexose, which means it has six carbons and a keto group on the right side, as well as the penultimate hydroxy group.
03

Structure of   D-Fructose and  L-Fructose in Fischer projections.

Knowing the structure of D-Fructose, we can simply swap out each stereogenic centre to createL-Fructose, as shown in the diagram below.

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Most popular questions from this chapter

Identify each of the following pairs of Fischer projections as enantiomers or identical compounds: (13.2,13.3)

Draw the Fischer projection for the other enantiomer of a to d in problem 13.22.

For each of the following, give the monosaccharide units produced by hydrolysis, the type of glycosidic bond, and the name of the disaccharide including 伪or 尾:

What reactants are needed for photosynthesis and respiration?

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