Tetrachlorocyclopropene is a chemical compound with the formula C3Cl4.

A colorless liquid, the compound is a reagent used to prepare acetylene derivatives and in organic synthesis.

[2] It can react with water and alcohols rapidly.

[3] The compound is used to prepare arylpropiolic acids: Under some circumstances, diarylation occurs, giving diarylcyclopropenones, which decarbonylate to give diarylacetylenes.

These reactions are thought to proceed via the intermediacy of trichlorocyclopropenium electrophile (C3Cl3+).