In the diene synthesis reaction bai, that is, the D-A reaction,
Conjugated diene du, called zhi diene
Monoolefins, called dienophiles
Since the dao mechanism of this reaction is the flow of electrons from the dienophile to the dienophile,
Therefore, the electron-donating group is connected to the diene body, such as alkyl groups such as CH3-,
Electron withdrawing groups are attached to the dienophile, such as NO2- etc.
The reaction is easier to proceed.