Question

How does enolate ion of acetoacetic ester is highly stabilized

Answer 1

Answer:

It is stabilized by resonance interaction with both the carbon–carbon double bond and the carbonyl group. The two possible enolate ions of the second compound lack the resonance interaction with a carbon–carbon double bond.

Answer 2

Answer:

$\color{magenta}{This is a Claisen condensation reaction. An ester enolate nucleophile attacks a second molecule of the ester, displacing the alcohol portion as a leaving group which will be protonated giving the alcohol. (d) This is an intramolecular Claisen known as a Dieckmann condensation}$

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