Trifluoroacetic Anhydride

Trifluoroacetic anhydride (TFAA) is a clear, colorless liquid with the formula (CF3CO)2O. It is the anhydride of trifluoroacetic acid and is commonly used as a dehydrating agent and reagent in various chemical reactions.

It can be used to remove water from reactions. 

Dosage

It can be used as a catalyst in certain reactions, such as the nitration of toluene