The two enantiomers of the amino acid leucine, HOOCCH(NH 2 )CH 2 CH(CH 3 ) 2 , has to be drawn and each enantiomer must be labelled as R or S. Concept introduction: Enantiomers are the non-superimposable mirror images of each other. Optical isomers are given R and S configuration by sequence rule that is by assigning 1 to 4 priorities to the substituents attached at the chiral center on the basis of their atomic number higher the atomic number higher is the priority followed by rotating the molecule from the side of highest priority group to that of the lowest priority. If the molecule rotates in clockwise direction then it is assigned R configuration while if it rotates in anticlockwise direction then it is assigned S configuration.

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Chapter 5, Problem 5.49P

Interpretation Introduction

Interpretation: The two enantiomers of the amino acid leucine, HOOCCH(NH₂)CH₂CH(CH₃)₂, has to be drawn and each enantiomer must be labelled as R or S.

Concept introduction: Enantiomers are the non-superimposable mirror images of each other. Optical isomers are given R and S configuration by sequence rule that is by assigning 1 to 4 priorities to the substituents attached at the chiral center on the basis of their atomic number higher the atomic number higher is the priority followed by rotating the molecule from the side of highest priority group to that of the lowest priority. If the molecule rotates in clockwise direction then it is assigned R configuration while if it rotates in anticlockwise direction then it is assigned S configuration.

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