Protolysis of tert-butyl fluoroformate [Eq.(a)] in a solution of FSO3H/SbF5-SO2ClF at −78°C yields the stable protonated form of the elusive fluoroformic acid [FC(OH)2]+. It was characterized by 1H, 13C, and 19F NMR spectroscopy. Evidence was also obtained for the formation of fluorocarbonyl cation [FCO]+, but not for diprotonated fluororformic acid [FC(OH2)OH2]+.
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Olah et al. (1997) studied this question.
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