Question

Which is the main product of the following reaction ?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

Diesters on reacting with strong base undergoes intramolecular condensation reaction to give a cyclic $\beta$-keto ester product. This reaction is called Dieckmann condensation reaction.


The enolate ion formed at alpha carbon of one ester group will attack the electrophilic carbon of other ester group to form stable 5 membered ring product.
Hence, the correct answer is option (a).