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Perfluoroisobutene

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.

Production and reactions
PFIB is one product of pyrolysis of polytetrafluoroethylene (PTFE). Tetrafluoroethylene thermally dimerizes to octafluorocyclobutane, which above 600 °C degrades to hexafluoropropylene and PFIB. ==Safety==
Safety
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==
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