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Alastair J. J. Lennox and Prof. Dr. Guy C. Lloyd-Jones Preparation of Organotrifluoroborate Salts: Precipitation-Driven Equilibrium under Non-Etching Conditions Angewandte Chemie International Edition 51

Article first published online: 17 AUG 2012 | DOI: 10.1002/anie.201203930

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Simple, rapid, and scaleable: In contrast to current procedures using corrosive HF/MF or MHF2 reagents (M=e.g. K), a wide range of trifluoroborates can be rapidly, simply, and safely prepared from MF (M=K, Cs), RCO2H, and a boronic acid/ester in regular glassware (see figure; left versus right). The use of L-(+)-tartaric acid as an alkali-metal sponge is key and allows isolation of RBF3M by a simple stir/filter/evaporate sequence.

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