Pentafluoro styrene

Phosphonated poly(pentafluoro- styrene) 3.89 10-100 mS cm at 10 Pa partial water pressure between 97 and 180 °C 63... 

Kinetic studies of the gas-phase pyrolysis of 1-aiylethyl acetates (ArCHMe-O COMe Ar = Ph or CeF ) have established that, at 625 K, pentafluoro-styrene is formed 4.60 times more slowly than styrene undo identical conditions. Previous results with monofluoro-compounds show that, if the effects of the fluorine atoms were additive, a retardation factor of 7.75 woidd be obsraved, and it is suggested that the five fluorine atoms are acting to some extent in opposition and that the full —I effect of each cannot be exerted. " Similar conclusions have been reached as a result of studies of the u.v. spectrum of 2,3,4,5,6-pentafluoro-Malachite Green (64) (synthesized via the reaction of pentafluorophenyl-lithium with Michler s ketone), which shows a bathochromic shift of only 37 nm in the A -band with respect to the unfluorinated analogue. ... 

The cationic olefin polymerization with regard to cleaner methods has been reviewed (1). The sustainable s5mthesis of monomers for cationic polymerization has been also dealt with. Tris(pentafluoro-phenyl)gaUium and aluminum, respectively, are active coinitiators for the production of medium-high molecular weight pol5mers of styrene and isobutene under aqueous reaction conditions (2). 

Lou, L., Koike, Y, and Okamoto, Y. (2010) Synthesis and properties of copolymers of methyl methacrylate with 2,3,4,5,6-pentafluoro and 4-trifluoromethyl 2,3,5,6-tetrafluoro styrenes an intrachain interaction between methyl ester and fluoro aromatic. J. Polym. Sci, Part A Polym. Chem., 48 (22), 4938 -4942. 

Since it is possible that the homopolymerization may become difficult if the aliphatic hydrogen atoms of styrene are replaced by fluorine, it is better to use D atoms instead. Thus, pentafluoro-trideutero-styrene, 5F3DSt, polymer has been examined as... 

Isolated reports mentioned the use of NHC-Ru species for the asymmetric Diels-Alder reaction of methacrolein and cyclopentadiene/ cyclopropana-tion of styrene with ethyl diazoacetate/ or dehydrative condensation of Al-(2-pyridyl)benzimidazole and allyl alcohol. Whittlesey and co-workers described the stoichiometric activation of C-F bonds in perfluoroaromatic substrates such as hexafluorobenzene, perfluorotoluene, and pentafluoro-pyridine using the dihydrido complex 49 (Scheme 7.9). Modification of the NHC nitrogen substituents from N-alkyl to N-aryl groups and replacement of the chelating diphosphine with two triphenylphosphine ligands afforded complexes 50 that performed the catalytic hydrodefluorination of polyfluoroarenes with alkylsilanes with reasonable turnover number (up to 200) and frequency (up to 0.86 h ). ... 

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