Jp. Begue et al., COMPARATIVE REACTIVITIES OF TRIFLUOROMETHYL-SUBSTITUTED AND PENTAFLUOROETHYL-SUBSTITUTED VINYL ETHERS IN ACID-CATALYZED HYDRATION, Gazzetta chimica italiana, 125(9), 1995, pp. 399-402
The protonation of fluorinated alkenes shows a greater retardation by
a factor of 2.8 by C2F5 compared to CF3 substituents in carbocation fo
rmation, and larger k(H)/k(alpha-Rf) rate ratios compared to solvolysi
s reactions, a result ascribable to ground-state steric and electronic
destabilization of the solvolysis substrates.