Haloalkenes

Chlorotrifluoroethylene (CTFE) is a chlorofluorocarbon with chemical formula CFCl=CF2. It is commonly used as a refrigerant in cryogenic applications. CTFE has a carbon-carbon double bond and so can be polymerized to form polychlorotrifluoroethylene or copolymerized to produce the plastic ECTFE. PCTFE has the trade name Neoflon PCTFE from Daikin Industries in Japan, and it used to be produced under the trade name Kel-F from 3M Corporation in Minnesota.

A dichlorodifluoroethylene (systematically named dichlorodifluoroethene) is one of three compounds with the chemical formula . Dichlorodifluoroethylenes are colourless gases, and are some of the simplest chlorodifluoroalkenes.

Iodotrifluoroethylene is the organofluorine compound with the formula . It is a volatile colorless liquid.

Bromotrifluoroethylene (BTFE) is a halogenated ethylene derivative with the chemical formula . It is a highly flammable colourless gas with a musty odour resembling phosgene. It can polymerise spontaneously.