Hexachloropropene is a compound of chlorine and carbon with the linear formula CCl<sub>3</sub>CCl=CCl<sub>2</sub>. It is a colourless liquid at room temperature. It is toxic for humans.
Hexachloropropene can be produced by the dehydrochlorination reaction of 1,1,1,2,2,3,3-heptachloropropane by potassium hydroxide in methanol solution. 1,1,1,2,2,3,3-Heptachloropropane is produced by the reaction of chloroform and tetrachloroethylene:
Hexachloropropene can be used to produce other compounds such as uranium tetrachloride, anhydrous niobium pentachloride and tungsten hexachloride.