Aldehyde adduct of hexafluoropropylene oxide, method of manufacturing trifluoropyruvyl fluoride dimer and method of manufacturing perfluoro(2,4-dimethyl-2-fluoroformyl-1,3-dioxolane)

A method of manufacturing a trifluoropyruvyl fluoride dimer the method comprising:

• reacting hexafluoropropylene oxide and aldehyde at a temperature of from 0° C. to 99° C. for 0.5 hour to 12.0 hours, thereby generating an adduct of the aldehyde with the hexafluoropropylene oxide, and then
• aging a reaction product of the hexafluoropropylene oxide and the aldehyde at a temperature of from 100° C. to 150° C. for 5 hours to 48 hours, after the reacting,
• wherein the aldehyde is at least one aldehyde selected from the group consisting of butyraldehyde, valeraldehyde, pivaldehyde, 4-methoxybenzaldehyde, and 2-methoxybenzaldehyde.