Chapter 28, Problem 29P

Interpretation Introduction

Interpretation:

The conversion of a ${\text{C}}_{\text{2}}$ compound to a ${\text{C}}_{\text{5}}$ compound using carbon skeleton designation is to be stated.

Concept Introduction:

Steroids, a group of tetracyclic lipids composed of one five-membered ring and three six-membered rings. Cholesterol contains a tetracyclic carbon skeleton that is the characteristic of steroids. The acetyl- $\text{CoA}$ molecule contains two carbon atoms and acts as a ${\text{C}}_{\text{2}}$ compound. The synthesis of cholesterol molecule begins with the sequential condensation of $3$ acetyl- $\text{CoA}$ molecules to yield the $3$ -hydroxy- $3$ -methylglutaryl- $\text{CoA}$

$\left(\text{HMG-CoA}\right)$ compound.