ORGANIC CHEMISTRY BOOK& SG/SM
ORGANIC CHEMISTRY BOOK& SG/SM
6th Edition
ISBN: 9781264094493
Author: SMITH
Publisher: MCG
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Chapter 22, Problem 55P
Interpretation Introduction

Interpretation: The structure of Y is to be identified and the stepwise mechanism for the conversion of Y to rofecoxib is to be drawn.

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 α carbon atom of carbonyl compound to form an enolate. This enolate reacts with carbonyl group of other carbonyl compounds that lead to the formation of β-ketoester.

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