Question

Predict the products of the following proposed Diels–Alder reactions. (e)

Accepted Answer

Step 1: Identify the components of the Diels–Alder reaction. The reaction involves a conjugated diene (cyclohexadiene) and a dienophile (the molecule with two aldehyde groups attached to a triple bond). The diene will provide the π-electrons, while the dienophile will act as the electron-deficient partner. Step 2: Analyze the dienophile. The triple bond in the dienophile is electron-deficient due to the electron-withdrawing aldehyde groups (-CHO). This makes it highly reactive toward the diene in the Diels–Alder reaction. Step 3: Predict the regiochemistry. The electron-withdrawing groups on the dienophile will direct the reaction such that the new bonds form in a way that maximizes stability. The aldehyde groups will likely end up on the same side of the newly formed six-membered ring. Step 4: Draw the product structure. The Diels–Alder reaction will result in a six-membered ring where the triple bond of the dienophile becomes a double bond, and the conjugated diene forms two new single bonds with the dienophile. The aldehyde groups will remain attached to the carbons where they were originally located. Step 5: Confirm stereochemistry. The reaction is stereospecific, meaning the substituents on the dienophile (aldehyde groups) will retain their relative orientation (cis or trans) in the product. Since both aldehyde groups are on the same side of the dienophile, they will remain cis in the final product.

Predict the products of the following proposed Diels–Alder reactions.
(e)

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Key Concepts

Diels–Alder Reaction

Conjugated Dienes

Dienophile