Fluorinated styrenes, preparation

As noted, these zinc reagents find extensive application in the preparation of fluorinated styrenes [113, 114], aryl-substituted fluorinated propenes [114],fluor-inateddienes [115,116], and tnfluorovinyl ketones [117], as illustrated in equations 83-88... 

Additions of elemental halogens to unsaturated compounds are among the most common preparations of halogenated fluoroorganics. The transformations are usually fairly clean and proceed in good yields. Besides the numerous examples of halogen addition tofluoroalkenes and fluoroalkyl-substituted alkenes, additions to perfluoropropyl vinyl ether [2] and fluorinated styrenes [5, 4] have been reported. Both ionic and free-radical processes occur (equations 1 and 2)... 

Olefinic Compounds and Related Polymers.— The synthesis and polymmiz-ation of fluorinated styrenes and phenyl vinyl ethers has been reviewed." Patent claims for the preparation of octafluorostyrmie (see Vol. 1, p. 200) have been extended to cover old work on the dehydrochlorination of (2-cMofo-l,2,2>trifluoroethyl)pentailuorobenzene with molten potassium hydroxide or with carbon pellets impregnated with potassium hydroxide. Reasonable yields of the styrene can be obtained by these methods, but the route from readily available materials is long, and a more convenient laboratory preparation involves the reaction of pentafluorophenylcopper with trifluoro-iodoethylene (55 % yield). The reaction of pentafluorophenyl-lithium with an excess of tetrafluoroethylene in ether at -20 °C also gives octafiuoro-... 

Fluorinated styrenic polymers have been prepared via radical polymerization using TEMPO or SGI as mediators, for a potential application in the design of amphiphilic block copolymers used as stabilizers in supercritical carbon dioxide dispersion polymerization. "" ... 

The formation of coagulum is observed in all types of emulsion polymers (i) synthetic rubber latexes such as butadiene-styrene, acrylonitrile-butadiene, and butadiene-styrene-vinyl pyridine copolymers as well as polybutadiene, polychloroprene, and polyisoprene (ii) coatings latexes such as styrene-butadiene, acrylate ester, vinyl acetate, vinyl chloride, and ethylene copolymers (iii) plastisol resins such as polyvinyl chloride (iv) specialty latexes such as polyethylene, polytetrafluoroethylene, and other fluorinated polymers (v) inverse latexes of polyacrylamide and other water-soluble polymers prepared by inverse emulsion polymerization. There are no major latex classes produced by emulsion polymerization that are completely free of coagulum formation during or after polymerization. 

Me, Ph, CjH FeCp) A series of fluorinated alcohol derivatives were also prepared.The addition of (Me2SiO)3 followed by Me3SiCl or further addition of cyclosiloxane gives slloxane or poly (slloxane) substituents. The addition of CO2 to the lithiated intermediate gives a carboxylate function which can be converted to the free acid or esterifled with p-nitrobenzylbromide. The addition of styrene to [NP(CH2Li)Ph] causes anonic polymerization of styrene and thus the formation of poly(methylphenylphosphazene)-graft-polystyrene copolymers. 

REDOR was also applied to examine the structure and dynamics of interfaces of heterogeneous polymer blends. A heterogeneous blend was prepared from [carbonyl- C]polycarbonate and poly(p-fluorostyren-co-styrene) copolymer of p-fluorostylene. The blend was formed by coprecipitation from chloroform into methanol. A fluorine dephased REDOR signal indicates that the 1 polycarbonate chain in 20 exists at the interface, suggesting that the polycarbonate phase is embedded in a continuous polystyrene matrix which is 200 A thick or 400 A in diameter [54],... 

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