question_answer

Which of the following reaction would undergo Diels-Alder reaction?

(I)

(II)

(III)

(IV)

A) All of the above  

B)        (II), (III), (IV)        

C)    (III), (IV)      

D)        (II)

Correct Answer: C

Solution :

    [c]

(I) For Diels-Alder reaction, dienes should have EDG and dienophile should have EWG. So (I) does not react.

(II) Diene (buta-l,3-diene) has S-trans conformation, so does not react.

(III) Undergoes Diels-Alder reaction.

(IV) Undergoes intramolecular Diels-Alder reaction.

The product is: It is an example of intramolecular Diels-Alder reaction: