Chapter 21.5, Problem 17P

Interpretation Introduction

Interpretation:

The equation for the formation of carbon-carbon bond in the cyclization of ethyl- $4$ -oxohexanoate to $\text{2}$ -methyl- $1,3$ -cyclopentanedioneis to be stated. The structure of the enolate ion and curved arrowsindicating the nucleophilic addition to the carbonyl group is to be shown. Also, the equation for the dissociation of the tetrahedral intermediate to form the final product is to be written.

Concept Introduction:

>

Enol refers to an intermediate structure that consists of an alkene group connected with a hydroxyl group at one end of its double bond that is $\text{C=C}\left(\text{OH}\right)$.

>

Nucleophilic addition is the addition reaction of the electrophilic compound having multiple bonds with the electron rich or nucleophilic by forming two or three new single bonds from their corresponding multiple bonds.

>

Dissociation reaction is the types of reaction that the molecules or compounds are splitted.