Hexafluoroisobutylene is an organofluorine compound with the formula (CF3)2C=CH2.

This colorless gas is structurally similar to isobutylene.

It is used as a comonomer in the production of modified polyvinylidene fluoride.

It is produced in a multistep process starting with the reaction of acetic anhydride with hexafluoroacetone.

As expected, it is a potent dienophile.