Which one of the following esters cannot undergo Claisen self-condensation ?

Question

Which one of the following esters cannot undergo Claisen self-condensation ? (A) CH3CH2CH2COOC2H5 (B) C6H5COOC2H5 (C) C6H5CH2COOC2H5 (D) C6H11CH2COOC2H5

Tardigrade Admin · Accepted Answer

The ester which contains α-hydrogen atom undergoes Claisen-self condensation :

Q. Which one of the following esters cannot undergo Claisen self-condensation ?

$C H_{3} C H_{2} C H_{2} COO C_{2} H_{5}$

$C_{6} H_{5} COO C_{2} H_{5}$

$C_{6} H_{5} C H_{2} COO C_{2} H_{5}$

$C_{6} H_{11} C H_{2} COO C_{2} H_{5}$

The ester which contains $α$ -hydrogen atom undergoes Claisen-self condensation :

Q. Which one of the following esters cannot undergo Claisen self-condensation ?

CH3​CH2​CH2​COOC2​H5​

C6​H5​COOC2​H5​

C6​H5​CH2​COOC2​H5​