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In contrast with the HF/SbF5 superacid system and despite its strong acidity (H0= -14.1), CF3SO3H is not able to protonate reversibly small alkanes. At room temperature propane and n-butane do not exchange their hydrons for deuteriums with deuterated triflic acid. The H/D exchange occurring between isobutane and the CF3SO3D acid is regiospecific as observed in weaker acids such as D2SO4 or solid acids...
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