Chapter 29.8, Problem 16P

Interpretation Introduction

Interpretation: The enantiomer and any two diastereomers of cholesterol are to be drawn, and the position for $\text{OH}$ group of cholesterol as an axial or equatorial is to be identified.

Concept introduction: Steroids, a group of tetracyclic lipids composed of one five-membered ring and three six-membered rings. Thesse rings are lettered by A, B, C, and D. Most of the steroids contain two angular methyl groups. These methyl groups are numbered as $\text{C18}$ and $\text{C19}$ respectively.