Textbook Problem

Answers to all problems are at the end of this book. Detailed solutions are available in the Student Solutions Manual, Study Guide, and Problems Book.

1. Drawing Fischer Projection Formulas for Amino Acids Without consulting chapter figures, draw Fischer projection formulas for glycine, aspartate, leucine, isoleucine, methionine, and threonine.

Interpretation Introduction

Interpretation:

The Fischer projection formulas for the following amino acids should be drawn.

Glycine, Aspartate, Leucine, Isoleucine, Methionine and Threonine.

Concept Introduction:

Fisher projection formula is the method used to predict a stereo formula within two dimensions without hampering the stereochemical information.

Explanation of Solution

All amino acids contain $\alpha$ - carbon atom attached to an amino group, hydrogen bond, and a distinguishing R group.

The R group of glycine is hydrogen.

  

Glycine:

The R group of aspartates is a -CH₂COOH.

  

The R group of leucine is an isobutyl group.

  

The R group of isoleucine is a sec-butyl group.

  

The R group of methionine is a thioether of methyl and ethyl groups.

  

The R group of threonine contains another chiral carbon attached to methyl and a hydroxyl group.