1,2-Dichloro-1,1,2-trifluoroethane is a volatile liquid chlorofluoroalkane composed of carbon, hydrogen, chlorine and fluorine, and with structural formula CClF2CHClF. It is also known as a refrigerant with the designation R-123a.
Formation 1,1,2-Trichloro-1,2,2-trifluoroethane can be biotransformed in sewage sludge to 1,2-dichloro-1,1,2-trifluoroethane.
It can be made from the reaction of tetrachloroethylene with hydrogen fluoride as a byproduct of HCFC-123 synthesis.Banks, R.E.; Smart, B.E.; Tatlow, J.C. (1994). "Alternatives to Chlorofluorocarbons (CFCs)". Organofluorine Chemistry: Principles and Commercial Applications. New York, ABD: Springer Science & Business Media. p. 166. doi:10.1007/978-1-4899-1202-2.
Properties The critical temperature of R-123a is . The rotation of the molecule appears to be hindered by the present of chlorine on each carbon atom, but is eased at higher temperatures.
Use Although not deliberately used, R-123a is a significant impurity in its isomer, the widely used 2,2-dichloro-1,1,1-trifluoroethane (R-123).
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