A and B are isomers. Identify B. | vedclass

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(B) The reaction involves the base-catalyzed isomerization of an $\alpha,\beta$-unsaturated ketone. In the presence of $HO^\ominus$ and $H_2O$,the dou

Vedclass · Accepted Answer

$2,3-$dimethylcyclopent$-2-$en$-1-$one

Vedclass · Answer

(B) The reaction involves the base-catalyzed isomerization of an $\alpha,\beta$-unsaturated ketone. In the presence of $HO^\ominus$ and $H_2O$,the double bond in the cyclopentenone ring migrates to a more substituted position to form a more stable isomer. The starting material $A$ is $3$-ethylcyclopent-$2$-en-$1$-one. Under basic conditions,the double bond shifts to form the more stable,more substituted $2,3$-dimethylcyclopent-$2$-en-$1$-one $(B)$. This is a thermodynamic isomerization process where the more substituted alkene is favored.

$A$ and $B$ are isomers. Identify $B$.

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