Chapter 19, Problem 19.74P

Interpretation Introduction

(a)

Interpretation:

By using $\text{1, 4-cyclohexanedione monoethylene acetal}$, synthesis of $\text{4-ethylidenecyclohexanone}$ is to be determined.

Concept introduction:

Reaction of aldehyde or ketone with the Wittig reagent leads to the formation of alkene product. In this reaction, new $\text{C-C}$ bond is formed.

For the deprotection of monoethylene acetal group to carbonyl group, acidic condition $\left({\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right)$ is used.

Interpretation Introduction

(b)

Interpretation:

What problem would arise while synthesis of $\text{4-ethylidenecyclohexanone}$ from $\text{1, 4-cyclohexanedione}$ is to be explained.

Concept introduction:

Reaction of aldehyde or ketone with the Wittig reagent leads to the formation of alkene product. In this reaction, new $\text{C-C}$ bond is formed.