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- W2020836479 abstract "Abstract The reaction of tetrachloroethene or trichloroethene with hydrogen fluoride over a chromia catalyst in the vapour phase results in the production of 1,1-dichloro-2,2,2-trifluoroethane (R-123) and 1,1,1,2-tetrafluoroethane (R-134a), respectively. These compounds are formed by the initial addition of hydrogen fluoride to the unsaturate, followed by a series of reactions which involves either the direct, stepwise exchange of chlorine for fluorine or the stepwise elimination of hydrogen chloride and addition of hydrogen fluoride to the reaction precursors. The substitution of deuterium fluoride for hydrogen fluoride in the reaction with tetrachloroethene causes the reaction rate to be significantly enhanced, the selectivities to the product precursors to be decreased, and the selectivities to over-fluorinated products to be increased. These results are consistent with a reaction pathway involving predominantly chlorine/fluorine exchange. Reaction of deuterium fluoride with trichloroethene causes no change in the product selectivities, relative to the reaction with hydrogen fluoride. However, analysis of the isotope distribution of the products in this system reveals that both chlorine/fluorine exchange and HF addition/HCl elimination pathways are in evidence." @default.
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- W2020836479 date "1992-08-01" @default.
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- W2020836479 title "Kinetic isotope effects in the reactions of chloroethenes with hydrogen fluoride or deuterium fluoride and the elucidation of reaction pathways" @default.
- W2020836479 doi "https://doi.org/10.1016/s0022-1139(00)80633-8" @default.
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