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BITSAT 2012 Paper

Section: Chemistry

Question : 71 of 150

Marks: +1, -0

The preparation of ethyl acetoacetate involves:

Solution:

In Claisen condensation intermolecular condensation of esters containing a-hydrogen atom in presence of strong base produce b-keto ester.

\mathrm{CH_3COOC_2H_5}\text{Ethyl}\underset{}{\text{acetate}}

\mathrm{H.CH_2.CO.OC_2H_5}

\overset{\mathrm{C_2H_5ONa}}{\rightleftharpoons}

\underset{\text{Ethyl acetoacetate \, (\(\beta\)-ketoester)}}{\mathrm{CH_3 - \overset{\mathrm{O}}{\overset{\parallel}{\mathrm{C}}} - CH_2COOC_2H_5}}

\mathrm{C_2H_5OH}

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