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Reference.org
Perfluoroisobutene
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<p>Perfluoroisobutene (PFIB) is the <a href="/facts/Perfluorocarbon/jA9N6aoT">perfluorocarbon</a> with the formula (CF3)2C=CF2. Classified as a perfluoro<a href="/facts/Alkene/RtYcS6kU">alkene</a>, it is the fluorinated counterpart of the hydrocarbon <a href="/facts/Isobutene/Bl5REcDx">isobutene</a>. This colorless gas is notable as a highly toxic. </p>