Highly selective metal fluoride catalysts for the dehydrohalogenation of 3-chloro-1,1,1,3-tetrafluorobutane
2011
Teinz, Katharina | Wuttke, Stefan | Börno, Fabian | Eicher, Johannes | Kemnitz, Erhard
For the first time, dehydrochlorination and dehydrofluorination reactions are studied on the same substrate, 3-chloro-1,1,1,3-tetrafluorobutane, employing nanoscopic metal fluorides AlF₃, MgF₂, CaF₂, SrF₂, and BaF₂ as catalysts that are prepared according the fluorolytic sol–gel synthesis. AlF₃ is exclusively selective toward dehydrofluorination, whereas BaF₂ is 100% selective toward dehydrochlorination. The acid–base character of the catalysts is investigated and, as a result, mechanistic proposals for the dehydrofluorination and the dehydrochlorination are given. Thus, at high conversion level, selective catalysts for both dehydrofluorination and dehydrochlorination on the same substrate have been developed.
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