explain-why-the-highly-reactive-dienophile-maleic-anhydride-and-diene-a-engage-i

Question

Explain why diene B does not react in a Diels-Alder reaction with the dienophile maleic anhydride; however, diene A engages in a fast and efficient Diels-Alder reaction.

Accepted Answer

Diene B does not exist in s-cis conformation.

Answer

Diene B does not exist in s-trans conformation.

Answer

Diene B is not a stable alkene.

Answer

Diene B is not electrophilic.