How is Pentafluoropropanoic anhydride (CAS: 356-42-3) typically synthesized?

Pentafluoropropanoic anhydride is typically synthesized through the condensation of pentafluoropropanoic acid with itself or other compatible anhydrides. The reaction is usually carried out under anhydrous conditions to avoid hydrolysis. Commonly, this is achieved using a molecular sieve to remove trace moisture and ensuring the reaction is performed at low temperatures to minimize side reactions.