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प्रश्न
Write a note on the aldol condensation reaction of acetaldehyde.
उत्तर
The aldol condensation reaction of Acetaldehyde:
When acetaldehyde combines with dilute NaOH, it produces aldol (3-hydroxybutanal). When heated, the aldol produced removes the water molecule, yielding But-2 - enal.
\[\begin{array}{cc}
\ce{H}\phantom{.......................................................}\\
|\phantom{.......................................................}\\
\ce{H - C - C - H + H - \overset{∝}{C}H2- C - H ->[dil.][NaOH] H3C - \overset{β}{C}H - \overset{∝}{C}H - CHO}\\
\phantom{.}|\phantom{....}||\phantom{...................}||\phantom{....................}|\phantom{.....}|\phantom{......}\\\
\ce{\underset{(Acetaldehyde)}{H\phantom{..} ^{\bullet}_{\bullet}O^{\bullet}_{\bullet}}\phantom{................}O\phantom{...............} \underset{(3 - Hydroxybutanal)}{OH\phantom{..} H}}\phantom{....}\\
\end{array}\]
\[\begin{array}{cc}
\ce{H3C - CH - CH - CHO ->[Δ][-H2O] H3C - \overset{β}{\underset{(But - 2 - enal)}{CH = CH - CHO}}}\\
|\phantom{......}|\phantom{..................................}\\
\ce{\underset{(Aldol)}{OH\phantom{..} H}}\phantom{..................................}
\end{array}\]
