Copper(II) triflate is the copper(II) salt of trifluoromethanesulfonic acid (known simply as triflic acid) which has a chemical formula of Cu(OSO2CF3)2, abbreviated Cu(OTf)2.

This substance, first reported in 1972,[2] is a powerful Lewis acid.

It is used as a catalyst in several organic reactions, such as the Diels–Alder reaction[3] and cyclopropanation reactions[4] (much like rhodium(II) acetate).

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