The two different crossed Claisen reactions that form avobenzone are to be shown. Concept Introduction: In crossed claisen condensation reaction, the base abstracts the acidic proton from α − carbon atom of an ester to form enolate. This enolate reacts with carbonyl compound of other ester that leads to the formation of a β-keto ester . The crossed Claisen condensation always takes place between the two different carbonyl compounds.

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Chapter 24, Problem 24.18P

Interpretation Introduction

Interpretation: The two different crossed Claisen reactions that form avobenzone are to be shown.

Concept Introduction: In crossed claisen condensation reaction, the base abstracts the acidic proton from α− carbon atom of an ester to form enolate. This enolate reacts with carbonyl compound of other ester that leads to the formation of a β-keto ester. The crossed Claisen condensation always takes place between the two different carbonyl compounds.

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