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2-(Trifluoromethyl)-1-vinylcyclopropane (6) has been synthesized and its thermal rearrangement investigated. Both the interconversion of the cis and trans isomers of 6 and its irreversible conversion to a mixture of 3- and 4-(trifluoromethyl)cyclopentenes (1:3.9 ratio) proceeded slower than those of any previously reported 2-substituted vinylcyclopropane. It can be concluded that a trifluoromethyl substituent has little if any effect on C-C bond dissociation energies or upon carbon radical stability.