Perfluoroisobutene (PFIB) is the perfluorocarbon with the formula (CF3)2C=CF2. Classified as a perfluoroalkene, it is the fluorinated counterpart of the hydrocarbon isobutene. This colorless gas is notable for its high toxicity.
Perfluoroisobutene is highly toxic with an LCt = 880 mg⋅min⋅m−3 (mice). It is a Schedule 2 substance of the Chemical Weapons Convention. Its toxicity is comparable to that of phosgene. ==References==