Chapter 28, Problem 28.20P

Interpretation Introduction

(a)

Interpretation:

The given incomplete reaction is to be completed.

Concept introduction:

Claisen condensation takes place between two esters or between an ester and a ketone. In crossed Claisen condensation reaction, a base abstracts an acidic proton from an $\text{α}$ carbon atom of carbonyl compound to form an enolate. This enolate reacts with the carbonyl group of other carbonyl compounds that lead to the formation of $\beta \text{-}$ ketoester.

Interpretation Introduction

(b)

Interpretation:

The starting material that gives the compound in an aliphatic Claisen rearrangement is to be stated.

Concept introduction:

Claisen condensation takes place between two esters or between an ester and a ketone. In crossed Claisen condensation reaction, a base abstracts an acidic proton from an $\text{α}$ carbon atom of carbonyl compound to form an enolate. This enolate reacts with the carbonyl group of other carbonyl compounds that lead to the formation of $\beta \text{-}$ ketoester.