Key Concepts of Alpha Hydrogens and Related Reactions

These flashcards cover key vocabulary related to alpha hydrogens, enolates, enols, aldol reactions, and their mechanisms, providing a concise study tool for exam preparation.

Alpha Hydrogen

Hydrogens that are attached directly to the carbon adjacent to a carbonyl group; they are significantly more acidic than beta and gamma hydrogens.

Enolate

The negatively charged species formed when a carbonyl compound is treated with a strong base, leading to the removal of an alpha hydrogen and stabilization of the negative charge.

Enol

A compound with a hydroxyl group (-OH) directly attached to a carbon-carbon double bond, resulting from the tautomerization of a carbonyl compound.

Keto-Enol Tautomerization

Equilibrium between a ketone or aldehyde (keto form) and its enol form; typically, the keto form is more stable.

Aldol Reaction

A reaction where two carbonyl compounds react in the presence of a base, resulting in the formation of a beta-hydroxy carbonyl compound.

Haloform Reaction

A specific reaction of methyl ketones with halogens in the presence of a base, producing a carboxylic acid and haloform as byproducts.

Nucleophilic position

The position in a molecule that is capable of donating an electron pair, often involved in reactions with electrophiles.

Retro Aldol Reaction

The reverse of an aldol addition, where a beta-hydroxy carbonyl compound is converted back to starting carbonyl compounds.

Equilibrium Favoring Keto Form

In the keto-enol tautomerization of carbonyl compounds, the equilibrium typically favors the keto form due to its greater stability.

Strong Bases for Enolate Formation

Strong bases (like sodium hydride or LDA) can be used to fully deprotonate carbonyl compounds, creating predominantly enolate forms.