Hexachloropropene is a compound of chlorine and carbon with the linear formula CCl3CCl=CCl2.

[3] 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.

[4] 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.