Distribution between pentane and trifluoromethanesulfonic acid (TFMSA) and carbon‐13 NMR measurements showed that benzene and toluene are not protonated to any significant extent in TFMSA. This finding contradicts previous reports, and validates the ranking of superacids based on the extent of benzene protonation.
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Fǎrcaşiu et al. (1989) studied this question.
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