Fluorine → Trifluoromethanesulfonic anhydride

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Reaction Steps

Then, the first distillation of Example 1 was repeated, thereby to obtain 355.3 kg of trifluoromethanesulfonic acid anhydride which is colorless and transparent. By chemical analysis, this first distillate was found to have a purity of at least 99wt % and contain up to 0.5 wt % of trifluoromethanesulfonic acid ester, up to 0.5 wt % of trifluoromethanesulfonic acid, up to 5 wt ppm of phosphorus, and 550 wt ppm of free fluorine. The actual amount of trifluoromethanesulfonic acid anhydride produced by the reaction was 35.3 kg, and the yield was 75%, based on the amount of trifluoromethanesulfonic acid.

Provenance & Evidence