Trifluoroacetic anhydride

Trifluoroacetic anhydride (TFAA) is the acid anhydride of trifluoroacetic acid. In particular, trifluoroacetic anhydride is the perfluorinated derivative of acetic anhydride. Like many acid anhydrides, it may be used to introduce the corresponding trifluoroacetyl group. The corresponding trifluoroacetyl chloride, is a gas, making it inconvenient to work with. Trifluoroacetic anhydride is the recommended desiccant for trifluoroacetic acid.