(organic chemistry) The chemical synthesis of alkyl halides from alcohols via the treatment upon reflux of a large excess of thionyl chloride or bromide (SOX₂) in the presence of a small amount of a nitrogen base, such as a tertiary amine or pyridine or its corresponding hydrochloride or hydrobromide salt.

In organic chemistry, free-radical halogenation is a type of halogenation.

In organic chemistry, α-keto halogenation is a special type of halogenation.