Potassium fluoride carbonyl difluoride

However, hexafluoroacetone is broken down almost completely87 over potassium tetrafluoro-cobaltate(III) at 250°C only traces of trifluoroacetyl fluoride are detected, the rest being carbon tetrafluoride and carbonyl difluoride. This shows that even if perfluoro ketones are formed in fluorination processes, they will break down, thus demonstrating that transition metal fluoride fluorination will not produce polyfluoro ketones. 

The reaction of trimethyl(perfluorophenyl)silanc with carbonyl centers occurs under mild reaction conditions, similar to those used for trimethyl(trifluoromethyl)silane. Acetyl fluoride in acetonitrile in the presence of catalytic amounts of potassium fluoride gives l-fluoro-l-(penta-fluoropheny )ethyl acetate (12) in 65% yield. When the bifunctional acid fluoride perfluoro-glutaryl difluoride reacts with trimethyl(perfluorophcnyl)silane in acetonitrile in the presence of potassium fluoride, the perfluorinated diketone perfluoro(l,5-diphenylpcntane-l,5-dione)... 

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