Organic Chemistry: Principles and Mechanisms (Second Edition)
Organic Chemistry: Principles and Mechanisms (Second Edition)
2nd Edition
ISBN: 9780393663556
Author: Joel Karty
Publisher: W. W. Norton & Company
Question
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Chapter 24, Problem 24.26P
Interpretation Introduction

Interpretation:

Figure 24-13 for buta-1, 3-diene in its excited state and ethene in its ground state is to be redrawn. The same is to be done for buta-1, 3-diene in its ground state and ethene in its excited state. If these results are consistent with a Diels–Alder reaction being photochemically forbidden is to be determined.

Concept introduction:

A UV photon with sufficient energy () is capable of promoting an electron from ethene’s HOMO to its LUMO to generate the excited state. The excited state’s HOMO is the ground state’s LUMO. When a molecule of buta-1, 3-diene absorbs a photon with sufficient energy, an excited state of buta-1, 3-diene is generated, in which an electron from what was originally the HOMO now occupies what was originally the LUMO. When this excited state species encounters a molecule of ethene in the ground state, the HOMO and LUMO no longer have the appropriate symmetries to interact, making the reaction forbidden. Consequently, the Diels–Alder reaction is thermally allowed, but photochemically forbidden.

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Chapter 24 Solutions

Organic Chemistry: Principles and Mechanisms (Second Edition)

Ch. 24 - Prob. 24.11PCh. 24 - Prob. 24.12PCh. 24 - Prob. 24.13PCh. 24 - Prob. 24.14PCh. 24 - Prob. 24.15PCh. 24 - Prob. 24.16PCh. 24 - Prob. 24.17PCh. 24 - Prob. 24.18PCh. 24 - Prob. 24.19PCh. 24 - Prob. 24.20PCh. 24 - Prob. 24.21PCh. 24 - Prob. 24.22PCh. 24 - Prob. 24.23PCh. 24 - Prob. 24.24PCh. 24 - Prob. 24.25PCh. 24 - Prob. 24.26PCh. 24 - Prob. 24.27PCh. 24 - Prob. 24.28PCh. 24 - Prob. 24.29PCh. 24 - Prob. 24.30PCh. 24 - Prob. 24.31PCh. 24 - Prob. 24.32PCh. 24 - Prob. 24.33PCh. 24 - Prob. 24.34PCh. 24 - Prob. 24.35PCh. 24 - Prob. 24.36PCh. 24 - Prob. 24.37PCh. 24 - Prob. 24.38PCh. 24 - Prob. 24.39PCh. 24 - Prob. 24.40PCh. 24 - Prob. 24.41PCh. 24 - Prob. 24.42PCh. 24 - Prob. 24.43PCh. 24 - Prob. 24.44PCh. 24 - Prob. 24.45PCh. 24 - Prob. 24.46PCh. 24 - Prob. 24.47PCh. 24 - Prob. 24.48PCh. 24 - Prob. 24.49PCh. 24 - Prob. 24.50PCh. 24 - Prob. 24.51PCh. 24 - Prob. 24.52PCh. 24 - Prob. 24.53PCh. 24 - Prob. 24.54PCh. 24 - Prob. 24.55PCh. 24 - Prob. 24.56PCh. 24 - Prob. 24.57PCh. 24 - Prob. 24.58PCh. 24 - Prob. 24.59PCh. 24 - Prob. 24.60PCh. 24 - Prob. 24.61PCh. 24 - Prob. 24.62PCh. 24 - Prob. 24.63PCh. 24 - Prob. 24.64PCh. 24 - Prob. 24.65PCh. 24 - Prob. 24.66PCh. 24 - Prob. 24.67PCh. 24 - Prob. 24.68PCh. 24 - Prob. 24.69PCh. 24 - Prob. 24.70PCh. 24 - Prob. 24.71PCh. 24 - Prob. 24.72PCh. 24 - Prob. 24.73PCh. 24 - Prob. 24.74PCh. 24 - Prob. 24.75PCh. 24 - Prob. 24.76PCh. 24 - Prob. 24.77PCh. 24 - Prob. 24.78PCh. 24 - Prob. 24.79PCh. 24 - Prob. 24.80PCh. 24 - Prob. 24.81PCh. 24 - Prob. 24.82PCh. 24 - Prob. 24.83PCh. 24 - Prob. 24.84PCh. 24 - Prob. 24.1YTCh. 24 - Prob. 24.2YTCh. 24 - Prob. 24.3YTCh. 24 - Prob. 24.4YTCh. 24 - Prob. 24.5YTCh. 24 - Prob. 24.6YTCh. 24 - Prob. 24.7YTCh. 24 - Prob. 24.8YTCh. 24 - Prob. 24.9YTCh. 24 - Prob. 24.10YTCh. 24 - Prob. 24.11YTCh. 24 - Prob. 24.12YTCh. 24 - Prob. 24.13YTCh. 24 - Prob. 24.14YTCh. 24 - Prob. 24.15YTCh. 24 - Prob. 24.16YTCh. 24 - Prob. 24.17YT
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