Q62 / 160 · JIPMER 2009 · Chemistry

The reaction, $\mathrm{C}_6 \mathrm{H}_5 \mathrm{CHO}+\mathrm{CH}_3 \mathrm{COOC}_2 \mathrm{H}_5 \longrightarrow$ $\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}=\mathrm{CHCOOC}_2 \mathrm{H}_5$, is called

  • A
    Benzoin condensation
  • Correct answer
    B
    Claisen condensation
  • C
    Cannizaro's reaction
  • D
    Perkin reaction

Solution

Claisen condensation : Aromatic aldehyde condenses with esters having $\alpha$-hydrogen atoms like ethyl acetate, in the presence of metallic Na and $\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}$ to form esters of $\alpha, \beta$-unsaturated acids. $\begin{array}{r}\underset{\text { benzaldehyde }}{\mathrm{C}_6 \mathrm{H}_5 \mathrm{CHO}}+\underset{\text { ethyl acetate }}{\mathrm{H}_2 \mathrm{CH}-\mathrm{COOC}_2 \mathrm{H}_5 \xrightarrow[\mathrm{C}_2 \mathrm{H}_5 \mathrm{OH}]{\mathrm{Na}}} \\ \underset{\text { ethyl cinnamate }}{\mathrm{C}_6 \mathrm{H}_5 \mathrm{CH}=\mathrm{CHCOOC}_2 \mathrm{H}_5+\mathrm{H}_2 \mathrm{O}}\end{array}$

Hence, the correct answer is option: 'B'.

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