Darzens halogenation

Etymology
Discovered in 1911 by Auguste George Darzens.

Noun

 * 1)  The chemical synthesis of alkyl halides from alcohols via the treatment upon reflux of a large excess of thionyl chloride or bromide (SOX$2$) 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.