| 摘要 |
PURPOSE:To obtain trifluoromethanesulfonic acid anhydride by reacting trifluoromethanesulfonic acid with phosphorus pentachloride, adding a specific amount of water or phosphoric acid to the resultant reaction residue and recovering the unreacted trifluoromethanesulfonic acid. CONSTITUTION:Trifluoromethanesulfonic acid is reacted with phosphorus pentachloride in a molar amount of 2-4 times based on the trifluoromethanesulfonic acid at ambient temperature to 160 deg.C for about 3hr. The formed trifluoromethanesulfonic acid anhydride is distilled and recovered and water or phosphoric acid are simultaneously added to the resultant distillation residue so as to provide H2O in a molar amount up to 2 times based on the total P2O5 of the phosphorus pentachloride present in the above-mentioned distillation residue and the added phosphoric acid. The obtained solution is directly distilled or vacuum distilled or a metal trifluoromethanesulfonate is added thereto and the resultant mixture is distilled or vacuum distilled at 180-280 deg.C to afford the objective substance. The trifluoromethanesulfonic acid acid anhydride is useful as a synthetic raw material for medicines, polymerization initiators, etc.
|
