The reason for the participation of only terminal furan in a [ 4+2 ] reaction in the given compound has to be determined. Concept Introduction: Cycloaddition reaction is a concerted addition reaction of two reactants to form a ring; in which two π-bonds are converted to two σ-bonds. Diels-Alder reaction is a [ 4+2 ] cycloaddition reaction, in which a diene and dienophile undergoes cycloaddition reaction and producing a substituted cyclohexene Resonance is an electron displacement effect for stabilizing a molecule through delocalization of bonding electrons in the pi orbital. Delocalized electrons stabilize a compound. The extra stability gains from having delocalized electrons are called resonance stabilization or resonance energy.

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Chapter 16, Problem 77CP

Interpretation Introduction

Interpretation: The reason for the participation of only terminal furan in a [4+2] reaction in the given compound has to be determined.

Concept Introduction:

Cycloaddition reaction is a concerted addition reaction of two reactants to form a ring; in which two π-bonds are converted to two σ-bonds.

Diels-Alder reaction is a [4+2] cycloaddition reaction, in which a diene and dienophile undergoes cycloaddition reaction and producing a substituted cyclohexene

Resonance is an electron displacement effect for stabilizing a molecule through delocalization of bonding electrons in the pi orbital.

Delocalized electrons stabilize a compound. The extra stability gains from having delocalized electrons are called resonance stabilization or resonance energy.

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