When ethanal (CH_3CHO) and propanal (CH_3CH_2 | vedclass

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Question

(D) In cross-aldol condensation between ethanal $(CH_3CHO)$ and propanal $(CH_3CH_2CHO)$, four products are possible: two self-aldol and two cross-ald

Vedclass · Accepted Answer

$2-$methylbut$-2-$enal and $2-$methylpent$-2-$enal

Vedclass · Answer

(D) In cross-aldol condensation between ethanal $(CH_3CHO)$ and propanal $(CH_3CH_2CHO)$, four products are possible: two self-aldol and two cross-aldol products.$1$. Cross-aldol $1$: $CH_3CHO$ acts as the nucleophile (enolate) and $CH_3CH_2CHO$ acts as the electrophile. The product is $CH_3CH_2CH(OH)CH(CH_3)CHO$, which dehydrates to form $CH_3CH_2CH=C(CH_3)CHO$ ($2$-methylpent$-2-$enal).$2$. Cross-aldol $2$: $CH_3CH_2CHO$ acts as the nucleophile (enolate) and $CH_3CHO$ acts as the electrophile. The product is $CH_3CH_2CH(OH)CH_2CHO$, which dehydrates to form $CH_3CH=C(CH_3)CHO$ ($2$-methylbut$-2-$enal).Thus, the cross-aldol products are $2-$methylbut$-2-$enal and $2-$methylpent$-2-$enal.

When ethanal $(CH_3CHO)$ and propanal $(CH_3CH_2CHO)$ undergo cross-aldol condensation with dilute $NaOH$, the pair of products obtained by cross-condensation reaction is:

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