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The organo tetrafluoroborate compounds are represented by RBF4. Tetrafluoroborate anion is often associated with highly reactive species. Examples of tetrafluoroborates include tetraalkyl ammonium tetrafluoroborate, triethyloxonium tetrafluoroborate, ferrocenium tetrafluoroborate, 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-benzyl-3-methylimidazolium tetrafluoroborate and bis(pyridine)iodonium tetrafluoroborate. An ionic liquid, 1-ethyl-3-methylimidazolium tetrafluoroborate, is used as an electrolyte for voltammetty and also on the studies of compounds such as furaldehydes because of its electrochemical stability.
Trialkyloxonium tetrafluoroborates, are Meerweins reagents and are often used as alkylating agents. Tetrabutylammonium tetrafluoroborate had a high phase transfer catalytic (PTC) effect (J. Heterocyclic Chem., 2008, 45(5), 13711375). Tetrafluoroborate-based ionic liquids such as 1-Benzyl-3-methylimidazolium tetrafluoroborate, are employed as an efficient and green reaction medium for the synthesis of pyrimido[1,2-a]benzimidazoles. In the oxidation of various alcohols, bis(pyridine)iodonium tetrafluoroborate is used. 1-Butyl-3-methylimidazolium tetrafluoroborate is employed in desulfurization of liquid fuels. Dialkylaminodifluorosulfinium tetrafluoroborate salts are used in various reactions such as deoxyfluorination of alcohols, fluorination of aldehydes, ketones, carboxylic acids and glycosyl groups and activation of hydroxyl, carbonyl and carboxyl groups. The review on TPT (2,4,6-triphenylpyrylium tetrafluoroborate) as a facile electron-transfer photo-sensitizer provides many salient features (Miranda, M. A., Chem. Rev., 1994, 94 (4), 10631089).