Why the diene given does not undergo Dields-Alder reaction is to be explained. Concept introduction: In Diels-Alder reaction, a dienophile reacts with a diene to yield a cyclic adduct. The reaction takes place through 1, 4 addition of the dienophile into the diene through a cyclic transition state. These reactions occur rapidly with dienophiles having electron withdrawing substituent groups in conjugation with the double bond and if the diene adapts a s-cis conformation during the reaction. To explain: Why the diene given does not undergo Dields-Alder reaction.

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Chapter 14.SE, Problem 18VC

Interpretation Introduction

Interpretation:

Why the diene given does not undergo Dields-Alder reaction is to be explained.

Concept introduction:

In Diels-Alder reaction, a dienophile reacts with a diene to yield a cyclic adduct. The reaction takes place through 1, 4 addition of the dienophile into the diene through a cyclic transition state. These reactions occur rapidly with dienophiles having electron withdrawing substituent groups in conjugation with the double bond and if the diene adapts a s-cis conformation during the reaction.

To explain:

Why the diene given does not undergo Dields-Alder reaction.

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