Synthesis,Characterization, and Application of Two Al(ORF)3 Lewis Superacids |
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| Authors: | Dipl‐Chem Anne Kraft Dr Nils Trapp Dr Daniel Himmel Dipl‐Chem Hannes Böhrer Dipl‐Chem Peter Schlüter Dr Harald Scherer Prof?Dr Ingo Krossing |
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| Institution: | Institut für Anorganische und Analytische Chemie, Freiburger Materialforschungszentrum (FMF) and Freiburg Institute for Advanced Studies (FRIAS), Universit?t Freiburg, Albertstrasse 19, 79104 Freiburg (Germany) |
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| Abstract: | We report herein the synthesis and full characterization of the donor‐free Lewis superacids Al(ORF)3 with ORF=OC(CF3)3 ( 1 ) and OC(C5F10)C6F5 ( 2 ), the stabilization of 1 as adducts with the very weak Lewis bases PhF, 1,2‐F2C6H4, and SO2, as well as the internal C? F activation pathway of 1 leading to Al2(F)(ORF)5 ( 4 ) and trimeric FAl(ORF)2]3 ( 5 , ORF=OC(CF3)3). Insights have been gained from NMR studies, single‐crystal structure determinations, and DFT calculations. The usefulness of these Lewis acids for halide abstractions has been demonstrated by reactions with trityl chloride (NMR; crystal structures). The trityl salts allow the introduction of new, heteroleptic weakly coordinating Cl‐Al(ORF)3]? anions, for example, by hydride or alkyl abstraction reactions. |
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| Keywords: | alanes anions fluorinated ligands Lewis acids neutral adducts |
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