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The preparation of ethyl acetoacetate involves:
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Claisen condensation.
In Claisen condensation intermolecular condensation of esters containing $\alpha$ -hydrogen atom in presence of strong base produce $\beta$ -keto ester.
$\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}+\mathrm{H.CH}_{2} \cdot \mathrm{CO} . \mathrm{OC}_{2} \mathrm{H}_{5}$
Ethyl acetate
$\mathrm{CH}_{3} \mathrm{COOC}_{2} \mathrm{H}_{5}+\mathrm{H.CH}_{2} \cdot \mathrm{CO} . \mathrm{OC}_{2} \mathrm{H}_{5}$
Ethyl acetate
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