Which of the following compounds undergo aldol condensation? (a) HCHO (b) CCl3 CHO (c) (CH3)3 CH

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Which of the following compounds undergo aldol condensation?...

Key Concepts

Electrophilic Carbonyl Functionality

The electrophilicity of the carbonyl carbon in aldehydes and ketones makes it susceptible to nucleophilic attack by enolate ions. This reactivity is crucial in aldol condensation, as the interplay between nucleophilic enolate formation and electrophilic carbonyl centers drives the formation of new carbon–carbon bonds in the reaction mechanism.

Alpha Hydrogen Acidity

Alpha hydrogen acidity refers to the relative ease with which hydrogen atoms adjacent to a carbonyl group can be abstracted by a base to form an enolate ion. The presence and acidity of these alpha hydrogens determine whether a given carbonyl compound is capable of participating in aldol condensation reactions, since no alpha hydrogens means no enolate formation.

Enolate Formation

Enolate formation is a key step in the aldol condensation mechanism. When a base abstracts an acidic alpha hydrogen from a carbonyl compound, it forms an enolate ion that is resonance-stabilized, displaying nucleophilic character at the alpha carbon. The ability of a compound to form a stable enolate is critical for it to undergo aldol reactions.

Aldol Condensation

Aldol condensation is a reaction in organic chemistry where enolizable aldehydes or ketones react to form ?-hydroxy carbonyl compounds (aldols), which can then lose water to produce ?,?-unsaturated carbonyl compounds. It involves the formation of a carbon–carbon bond, typically through the generation of an enolate ion as a nucleophile attacking an electrophilic carbonyl carbon.

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