Chapter 24, Problem 24.25P

Interpretation Introduction

Interpretation:

A diagram similar to that in Figure 24-9b is to be drawn by assuming instead that an EWG is placed on the diene and an EDG is placed on the dienophile (thus establishing an inverse electron demand Diels–Alder reaction). How does the HOMO (diene)–LUMO (dienophile) energy gap compare to the one in Figure 24-9a is to be explained.

Concept introduction:

An electron-donating group raises the orbital energies. An electron-withdrawing group lowers the orbital energies.