Chapter 17.15, Problem 18P

Interpretation Introduction

Interpretation:

The structure of Nexium that shows the S configuration at its chirality center has to be drawn.

Concept Introduction:

The $R$ or $S$ configuration can be assigned by following CIP rules as follows:

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The numbering that is assigned to the groups that are bonded to the chiral carbon is done on the basis on the molecular weight and electronegativity of the respective groups.

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If the sequence of the numbering follows clockwise direction, the chiral atom is assigned with $R$ configuration and if the numbering follows anticlockwise direction, then $S$ configuration is assigned.