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Tetrachlorodifluoroethane
Tetrachlorodifluoroethane is the name for two isomers. * Tetrachloro-1,2-difluoroethane, also known as CFC-112 * Tetrachloro-1,1-difluoroethane Tetrachloro-1,1-difluoroethane or 1,1,1,2-tetrachloro-2,2-difluoroethane, Freon 112a, R-112a, or CFC-112a is an asymmetric chlorofluorocarbon isomer of tetrachloro-1,1-difluoroethane with formula CClF2CCl3. It contains ethane substituted by four c ..., also known as CFC-112a {{Short pages monitor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrachloro-1,2-difluoroethane
Tetrachloro-1,2-difluoroethane is a chlorofluorocarbon known as Freon 112, CFC-112 or R-112. It has a symmetrical structure CCl2FCCl2F and so can be called symmetrical tetrachlorodifluoroethane. "Symmetrical" may also be abbreviated to "s-" or "sym-". In contrast an asymmetrical isomer has formula CCl3CClF2. Production CFC-112 can be made in a reaction of hexachloroethane or tetrachloroethane with hydrogen fluoride and extra chlorine. This reaction is catalysed by aluminium fluoride with some extra iron, nickel and chromium at 400°C. The extra metal in the catalyst yields can be 98% compared with the unsymmetrical isomer. Mixed with perfluorooctane, it is a solvent for polydimethylsiloxane. CFC-112 can be prepared as a mixture with other hydrochlorofluorocarbons from trichloroethylene and anhydrous hydrogen fluoride when electric current is passed through. When CFC-11 is packaged with alcohol in a metal container, a free radical reaction can result in production of CFC-112. Pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |