5 years ago

Superacids Based on Pentafluoroorthotellurate Derivatives of Aluminum

Superacids Based on Pentafluoroorthotellurate Derivatives of Aluminum
Sebastian Riedel, Thomas W. Gries, Simon Steinhauer, Helmut Beckers, Anja Wiesner
The new Lewis acid Al(OTeF5)3 and its acetonitrile adduct CH3CNAl(OTeF5)3 were obtained by a simple one-step synthesis in batches of up to 15 g. Al(OTeF5)3 and the adduct were characterized by vibrational spectroscopy (IR, Raman) and quantum-chemical calculations. Furthermore, five different salts of the new weakly coordinating anion [Al(OTeF5)4]− were prepared in a two-step procedure. [Ph4P][Al(OTeF5)4], Cs[Al(OTeF5)4], [Ph3C][Al(OTeF5)4], as well as the protonated benzene derivatives [C9H13][Al(OTeF5)4] and [C6H7][Al(OTeF5)4] were characterized by low-temperature single-crystal X-ray diffraction and NMR spectroscopy. Arenium salts have rarely been characterized in the solid state and were synthesized in this work in a simplified fashion. Novel superacids: New Brønsted as well as Lewis superacids based on pentafluoroorthotellurates have been synthesized. The corresponding weakly coordinating anion has been used to stabilize carbocations, for example.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/anie.201702807

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