Question

Question: Draw both enantiomers of each amino acid and label them as Ror S:(a) phenylalanine; (b) methionine.

Short answer

Answer

a.

b.

Step-by-step solution

Step-by-Step SolutionStep 1: Phenylalanine

Phenylalanine has the molecular formula ${\mathbf{C}}_{\mathbf{9}}{\mathbf{H}}_{\mathbf{11}}{\mathbf{NO}}_{\mathbf{2}}$. It has several isomers, one of which is D-phenylalanine.

Methionine

Methionine is an essential amino acid comprising sulfur atoms. It is utilized to cure liver disorders.

Enantiomers of methionine and phenylalanine

The groups connected to the stereocenter are prioritized to determine the stereochemistry of a compound. The groups with a higher atomic number are given greater priority than those with a lower atomic number.

A compound is assigned R configuration if it rotates in the clockwise direction and is assigned S configuration if it rotates in the anticlockwise direction.

(a) The enantiomers of phenylalanine are given below:

Enantiomers of phenylalanine

(b) The enantiomers of methionine are given below:

Enantiomers of methionine