The reaction, C_6 H_5 CHO+CH_3 COOC_2 H_5 C_6 H_5 CH=CHCOOC _2 H_5 , is called

Correct answer: B. Claisen condensation Claisen condensation : Aromatic aldehyde condenses with esters having α -hydrogen atoms like ethyl acetate, in the presence of metallic Na and C_2 H_5 OH to form esters of α, β -unsaturated acids. array r benzaldehyde C_6 H_5 CHO + ethyl acetate H_2 CH-COOC_2 H_5 [C_2 H_5 OH] Na ethyl cinnamate C_6 H_5 CH=CHCOOC_2 H_5+H_2 O array

JIPMER 2009

Exam: JIPMER
Year: 2009
Subject: Chemistry
Chapter: Aldehydes and Ketones

JIPMER 2009 · Chemistry · Aldehydes and Ketones

The reaction, C_6 H_5 CHO+CH_3 COOC_2 H_5 C_6 H_5 CH=CHCOOC _2 H_5...

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

Options

ABenzoin condensation
BClaisen condensation
CCannizaro's reaction
DPerkin reaction

Correct answer

B. Claisen condensation

Step-by-step 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}

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