Question

In general, to increase the reactivity of the dienophile in a diels-alder reaction, what type of substituent should be added to the dienophile?.

Answer 1

that electron-donating groups increase the reactivity of the diene: ... Therefore, electron-donating groups on the diene increase its reactivity, while electron-withdrawing groups on the dienophile lower the LUMO energy level, thus support this electron flow as well.