Question

Question: What diene and dienophile are needed to prepare each Diels–Alder product?

a.

b.

c.

d.

Short answer

Answer

a.

Diene and dienophile of a.

b.

Diene and dienophile of b.

c.

Diene and dienophile of c.

d.

Diene and dienophile of d.

Step-by-step solution

Detect the 6-membered ring

Look for a 6-membered ring with a C=C. Draw curved arrows indicating the direction to cleave the bonds.

Formation of diene and dienophile

The curved arrows are followed to cleave the bonds to obtain the conjugated diene and the dienophile responsible for the formation of the given Diels-Alder product.

Diene and dienophile for the given products

a. The bonds are broken with the help of curved arrows to form diene and dienophile.

Diene and dienophile of product a.

b. The bonds are broken with the help of curved arrows to form diene and dienophile.

Diene and dienophile of product b.

c. The bonds are broken with the help of curved arrows to form diene and dienophile.

Diene and dienophile of product c.

d. The bonds are broken with the help of curved arrows to form diene and dienophile.

Diene and dienophile of product d.