The New Fluoro‐tris(pentafluoroethyl)borate Anion [(C2F5)3BF]—, Unexpected Formation of [(C2F5)3BH]— as a By‐Product. Das neue Fluoro‐tris(pentafluoroethyl)borat Anion [(C2F5)3BF]—, unerwartete Bildung des Nebenprodukts [(C2F5)3BH]— |
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Authors: | Gottfried Pawelke Helge Willner |
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Abstract: | Dimethylamine‐tris(pentafluoroethyl)borane (C2F5)3B · NHMe2 ( 1 ) has been obtained from C2F5I, Br2BNMe2 and tris(diethylamino)phosphane in sulfolane. Alkylation using CH3I/KOH yielded the trimethylamine‐tris(pentafluoroethyl)borane (C2F5)3B · NMe3 ( 2 ). Compound 2 reacts with NEt3×3HF at 200—204 °C under replacement of the trimethylamine ligand to form the novel fluoro‐tris(pentafluoroethyl)borate anion (C2F5)3BF]— ( 3 ) in good yield. Side products are the hydroxy‐tris(pentafluoroethyl)borate (C2F5)3BOH]— ( 4 ) and the hydrido‐tris(pentafluoroethyl)borate (C2F5)3BH]— ( 5 ). |
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Keywords: | Boron Pentafluoroethyl group |
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