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

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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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 ...

Solution Summary

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