Add time:07/26/2019         Source:sciencedirect.com

The liquid-phase fluorination of pentachlorotrifluoro-propane (1) and tetrachlorotetrafluoropropane (2) of defined isomer composition at atmospheric or autogenous pressure by means of the Henne-Swarts reagent yielded from 60% to 70% of tetrachlorotetrafluoropropane (2) and trichloropentafluoropropane (3). The vapour-phase fluorination of chlorofluoropropanes 1-3 with hydrogen fluoride catalysed by ferric salts on a charcoal support afforded chlorofluoropropanes 2 and 3 in addition to dichlorohexafluoropropane (4) in a yield of 13.5% to 79%. Simultaneously an isomerisation reaction took place in some cases. The isomer compositions of the starting substances and products were determined by means by 19F NMR spectroscopy. The NMR data of the isomers are given and compared with the chemical shifts calculated using the published empirical method [1].

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