Final answer:
The Dieckmann condensation of diethyl succinate results in a cyclic β-keto ester product. Given the molecular formula C₁₂H₁₆O₆, the product appears to be a dimer of the expected five-membered ring compound with two ethyl ester groups attached.
Step-by-step explanation:
When a Dieckmann condensation is attempted with diethyl succinate, the product obtained has the molecular formula C₁₂H₁₆O₆. This reaction involves the intramolecular condensation of diesters, and typically results in the formation of a cyclic product, which is a β-keto ester. With diethyl succinate specifically, the Dieckmann condensation would result in a five-membered cyclic β-keto ester.
The structure of this compound could therefore be represented as two ethyl ester groups (-COOC₂H₅) attached to a five-membered ring where one of the carbons carries a keto group (C=O). Given the molecular formula provided, it appears that the reaction may have formed a dimeric species, possibly due to further reactions involving the initial cyclic product.