Introduction
The tetrafluoroborate ion, BF4−, is often described as “inert,” “non-nucleophilic,” and a “spectator ion.” Whilst this holds true in many instances, there are in fact an ever-increasing number of synthetically-relevant examples of fluoride transfer from the BF4− ion to an electrophilic carbon atom resulting in formation of organic fluorides. Perhaps the best-recognised transformation of this type is the Balz-Schiemann reaction (production of aryl fluorides from the pyrolysis of aryldiazonium tetrafluoroborates), which was first reported 90 years ago [1]. The utility of tetrafluoroborate salts (as well as boron trifluoride) for organic fluoride synthesis was recently and comprehensively reviewed by us, including all reported examples up to the end of 2013 [2]. The present account aims to explicate to the reader the various tactics and pitfalls involved in those reactions which result in the preparation of alkyl fluorides (i.e., form a C(sp3)–F bond) in a synthetically...
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Davies, S.G., Roberts, P.M. (2020). Tetrafluoroborate Salt Fluorination for Preparing Alkyl Fluorides. In: Hu, J., Umemoto, T. (eds) Fluorination. Synthetic Organofluorine Chemistry. Springer, Singapore. https://doi.org/10.1007/978-981-10-3896-9_4
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