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Aldol condensation: why must aldehyde contain none of corresponding acid?

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In the aldol condensation with
benzaldehyde + acetone (NaOH, ethanol) --> dibenzalacetone

Why is it essential that the aldehyde component contain none of the corresponding acid?

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Solution Summary

This solution is provided in 233 words. It defines an aldol condensation and discusses naming conventions for reactions.

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Aldol condensation
Aldehydes and ketones containing an alpha hydrogen atom (H atom attached to the carbon atom adjacent to the carbonyl group) undergo self condensation in the presence of a dilute alkali to form beta hydroxy aldehyde or beta hydroxy ketone. This reaction is called aldol condensation.

Benzaldehyde does not ...

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