1,1,2,2-tetrafluoroethylsulfonic acid (also known as Tetrafluoroethanesulfonic acid, TFESA) is an alternative to Trifluoromethanesulfonic acid (TFSA,Triflic acid), which is a versatile synthetic toolkit in organic synthesis.
Preparation and synthetic applications of aryl tetraflates (ArOSO2CF2CF2H). 
 V.V.Rostovfsev, et al, J. Org. Chem., 2008, 7(2), pp 711-714.
NONH for all modes of transport
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