Chapter 16, Problem 40P

Interpretation Introduction

Interpretation:

The $3S,7S$ and $3S,7R$ stereoisomers of dianeackerone are to be drawn.

Concept introduction:

Stereoisomers are those compounds that differ in their stereochemistry around any one chiral carbon. They are designated as $R,S$, and the designation is based on the rotation of eye in moving from higher priority group (one which has higher molecular weight marked as $1$) to lower ones (marked as $2,3\text{ and }4$, with $4$ having the lowest priority). If the eye rotation is clockwise, the designation is $R$, and if anticlockwise, the designation is $S$.

Also, if the lowest priority group is above the plane, the designation is reversed.