Chapter 24, Problem 24.39P

Interpretation Introduction

Interpretation: The four compounds formed by the crossed claisen reaction of ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{CO}}_{\text{2}}\text{Et}$ and ${\text{CH}}_{\text{3}}{\text{CH}}_{\text{2}}{\text{CO}}_{\text{2}}\text{Et}$ are to be predicted.

Concept introduction: In crossed claisen condensation reaction, the base abstracts the acidic proton from $\text{α}$ carbon atom of an ester to form enolate. This enolate reacts with carbonyl group of other ester that leads to the formation of $\text{β}$-ketoester.