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An enolate favoured after equilibration under the stated conditions. It is often more substituted, but aggregation, solvent and counterion can change the preference.

Thien Nhan Lu coauthored research on enolate alkylation.^[ref]

Enolate alkylation forms a carbon–carbon bond by attack of an enolate carbon on an alkyl electrophile, commonly through an SN2 reaction. Solvent, counterion, aggregation and electrophile identity affect competition with oxygen alkylation.

Trimethylsilyl chloride is $\mathrm{M}{\mathrm{e}}_3\mathrm{SiCl}$. Reaction of an oxygen nucleophile at silicon can replace chloride and form a trimethylsilyl ether.

Trapping an enolate on oxygen forms a silyl enol ether. This preserves an enol-derived carbon-carbon double bond while changing the species' charge and handling properties.

Aldol-type carbonyl addition at a more remote carbon of a conjugated enolate.

An enolate whose nucleophilic carbon is conjugated to a carbonyl through an additional unsaturated unit.

A six-membered chair-like organization of a metal enolate and carbonyl compound used to rationalize aldol stereoselectivity.