Disproportionation reactions between CF₂H and C₂H₅ radicals in the gas phase

Abstract

The disproportionation and combination reactions between CF2H and C2H5 radicals have been studied in the gas phase from room temperature to 70°C. For the pathway which yields

Disproportionation reactions between alkyl and fluoroalkyl radicals. IV. Pentafluoroethyl and ethyl radicals

“…Product separation and analysis were effected using combination low-temperature fraction techniques and gc. Complete experimental details are given elsewhere [2,3,51.…”

“…For example, taking A(C2F5, C2H5) = 0.21, the value of Xf = (1.21 x 2.2)/(1.11)1'2 = 2.5 (and see the case of methyl and t-butyl later). However, an equation such as (IV) is the correct formulation, and larger changes can occur depending on the various A values involved; for CF2H and C2H5 radicals, X , = 1.7, and Xf = 2.2 [2,4].…”

“…The high temperatures employed (132" and 265°C) tend to make intercept determinations imprecise 131, and the left-hand side of eq. (I) was in error due to the assumption that reaction (2) was the only significant source of C4F5H,. Pitfalls of this nature were discussed in Parts I1 and I11 and are dealt with in the current study with a further modification.…”

Aromatic fluorocopolymers based on α-(difluoromethyl)styrene and styrene: synthesis, characterization, and thermal and surface properties

“…We also suspect that the presence of relatively labile proton in -CF 2 H group may result in chain transfer reactions to monomer or/and polymer. 52,53 These side reactions may disturb the propagation process signicantly effecting in formation of materials with low-molar masses and relatively high dispersities. However, the proton lability in the CF 2 H moiety may create an opportunity for post-modication allowing for new functional polymers synthesis.…”

Reinvestigation of the Unimolecular Reactions of CHF2CHF2: Identification of the 1,1-HF Elimination Component from Addition of :CFCHF2 to trans-2-Butene

“…The principal reactions are shown below; M denotes a bath gas molecule, and an asterisk denotes vibrational excitation. The disproportionation to combination ratio of ·CHF 2 radicals is 0.15. The :CF 2 will mainly recombine to C 2 F 4 or combine with ·CHF 2 to give ·CF 2 CHF 2 , which will abstract an I atom from CHF 2 I or recombine with another ·CHF 2 radical.…”