Question

Which of the following are the necessary conditions for Diels-Alder reactions?
(I) Non-linearity of dienes
(II) the s-cis conformation of dienes
(III) Dienes with EDG's and dienophile with EWG's groups
(IV) Dienes with EWG's and dienophile with EDG's groups

• A. (I), (ll), (III)
• B. (I), (II), (IV)
• C. (II), (III)
• D. (ll), (IV)

Answer 1

The correct option is A (I), (ll), (III)

Necessary conditions for Diels Alder reactions:

• Non-linearity of dienes. Dienes participating in the Diels Alder reactions are usually conjugated and cumulated.
• the s-cis conformation of dienes participate in Diels Alder reaction, they are less stable than s-trans dienes thereby reacting promptly.
• 
  
• Dienes have electron donating groups and dienophiles have an electron withdrawing groups directly attached to the double bond.
• Thus statement I, II, and III are correct. Thus the correct option is A.