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The Aldol Addition

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Question

What is the action of dil $N a O H$ on ethanal (acetaldehyde)? Name the reaction.

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Solution

In presence of dil $N a O H$ , two molecules of $a c e t a l d e h y d e$ add together to give $β h y d r o x y a l d e h y d e$ (aldol). The reaction is called aldol condensation.
$C H_{3} - C H O + C H_{3} - C H O d i l N a O H - ---- \to C H_{3} - C H (O H) - C H_{2} - C H O H^{+} - - \to Δ C H_{3} - C H = C H - C H O + H_{2} O$

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The Aldol Addition

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