Thermal decomposition of branched-chain perfluoroalkanes

Thermal isomerization of trifluoromethyl trifluorovinyl ether to pentafluoropropionyl fluoride

“…2): 1 The synthesis of the perfluorononanes (A) and (B) was performed by fluorination with elemental fluorine at 30 and 105 8C of the trimers of C 3 F 6 , respectively, [3]. The pyrolysis of these branched perfluoroalkanes [4,5] initially consists of an equilibrium between the starting reagent and the two perfluoroalkyl radicals deriving from the homolytic cleavage of the most substituted carbon-carbon bond, followed by the rearrangement and the recombination of the same radicals. Therefore, in the reaction mixture, the perfluorononanes act as a source of CF 3 , i-C 3 F 7 radicals and other more sterically hindered perfluoroalkyl radicals, which can start the radical chain reaction of isomerization of MVE.…”

Tetrafluoroethylene telomerization using dibromohaloethanes as telogens

“…Initiator (iv) was synthesized according to known literature procedures [16,17] and was purified by fractional distillation at reduced pressure to >99% purity immediately prior to its use. The spectra obtained compared well with those reported in the literature.…”

“…All 19 F NMR and MS spectra and bp of the isolated compounds were then compared [16,17,23,24] with those of pure samples purchased from Sigma Chemical Co. …”

The Stability of Perfluoro-N-Octane During Vitreoretinal Procedures

“…For example, a branched-chain perfluoro-octane has been shown to decompose completely by carbon-carbon bond scission at 240°C, to produce inter alia perfluoroisobutylene. 22 Highly branched structures are also more likely to show chemical reactivity toward carbon-fluorine bond substitution.24 Therefore, these findings should not be extrapolated to highly branched fluorocarbons, such as perfluorodecalin or perfluorophenanthrene, or to nitro¬ gen-containing PFCLs, such as perfluorotributylamine or perfluorotri-N-propylamine.…”