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Which reaction, intermediate is formed during the condensation reaction between acetaldehyde and formaldehyde ?
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$: \overline{\mathrm{CH}}_{2} \mathrm{CHO}$
The $\alpha$ -hydrogen atoms of acetaldehyde due to $-E$ effect of $>\mathrm{C}=\mathrm{O}$ group is slightly acidic
in nature. In crossed aldol condensation between formaldehyde and acetaldehdye in the first step $\mathrm{OH}^{-}$ ion (from the base added) abstracts one of these acidic $\alpha$ -hydrogens to form carbanion or enolate ion which is stabilised by resonance.
in nature. In crossed aldol condensation between formaldehyde and acetaldehdye in the first step $\mathrm{OH}^{-}$ ion (from the base added) abstracts one of these acidic $\alpha$ -hydrogens to form carbanion or enolate ion which is stabilised by resonance.
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