The Cover Feature shows the office environment of an organic synthesis laboratory, centered around a “synthetic tools desk,” which is a place where ideas are discussed on a daily basis. In their Research Article, R. H. Bartz et al. demonst...
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An Amorphous Teflate Doped Aluminium Chlorofluoride: A Solid Lewis‐Superacid for the Dehydrofluorination of Fluoroalkanes
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A pentafluoroorthotellurate doped aluminium chlorofluoride (ACF-teflate, AlCl0.1F2.8(OTeF5)0.1) was synthesized. The amorphous Lewis-superacidic material catalyzes the dehydrofluorination of fluoroalkanes to yield olefins and H2.
Abstract
An anion-doped aluminium chlorofluoride AlCl0.1F2.8(OTeF5)0.1 (ACF-teflate) was synthesized. The material contains pentafluoroorthotellurate (teflate) groups, which mimic fluoride ions electronically, but are sterically more demanding. They are embedded into the amorphous structure. The latter was studied by PDF analysis, EXAFS data and MAS NMR spectroscopy. The mesoporous powder is a Lewis superacid, and ATR-IR spectra of adsorbed CD3CN reveal a blue-shift of the adsorption band by 73 cm−1, which is larger than the shift for SbF5. Remarkably, ACF-teflate catalyzes dehydrofluorination reactions of monofluoroalkanes to yield olefins in C6D6. In these cases, no Friedel-Crafts products were formed.
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