Trifluoromethylsulfonyl

Triflyl, more formally known as trifluoromethanesulfonyl, is a functional group with the formula F₃CSO₂–. The triflyl group is often represented by –Tf.

The closely related triflate group (trifluoromethanesulfonate) has the formula F₃CSO₂O–, and is represented by –OTf.