Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 29, Pages 8578-8582Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201704097
Keywords
gas-phase electron diffraction; Lewis superacid; tris(pentafluorophenyl)borane; tris(perfluorotolyl)borane
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Funding
- Deutsche Forschungsgemeinschaft [MI-477/21-1]
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Tris[tetrafluoro-4-(trifluoromethyl)phenyl] borane (BTolF) was prepared by treating boron tribromide with tetrameric F3CC6F4-Cu-I. The F3CC6F4-CuI was generated from F3CC6F4MgBr and copper(I) bromide. Lewis acidities of BTolF evaluated by the Gutmann-Beckett method and calculated fluoride-ion affinities are 9 and 10%, respectively, higher than that of tris(pentafluorophenyl) borane (BCF) and even higher than that of SbF5. The molecular structures of BTolF and BCF were determined by gas-phase electron diffraction, that of BTolF also by single-crystal X-ray diffraction.
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