Organic Chemistry Plus Mastering Chemistry with Pearson eText -- Access Card Package (9th Edition) (New in Organic Chemistry)
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Chapter 15.12C, Problem 15.19P
Interpretation Introduction

Interpretation:

The explanation corresponding to the given statement that the [4+2] Diels-Alder reaction is photochemically forbidden is to be proved.

Concept introduction:

When ultraviolet light is used rather than heat for [4+2] Diels-Alder reaction, it is photochemically not allowed. A photon with correct energy strikes 1,3butadiene, due to which one of the pi electrons gets excited to the next high molecular orbital. This high orbital is now occupied and is the new HOMO of the excited molecule.

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Organic Chemistry Plus Mastering Chemistry with Pearson eText -- Access Card Package (9th Edition) (New in Organic Chemistry)

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