Perfluoroalkanoic acids thermal stability

Perfluoroalkylcopper reagents are the most studied perfluoroalkyl organometallic reagents due to their unique combination of thermal stability and chemical reactivity. They are readily prepared by copper metal insertion reactions with perfluoroalkyl halides in a coordinating solvent (e.g., formation of decarboxylation reactions of perfluoroalkanoic acid salts and copper(I) halide (e.g., formation of 2 ), or metathesis reactions (e.g., formation of 4 via 3 ). (Trifluoro-methyl)copper (4) has also been recently accessed by decomposition of methyl 2,2-difluoro-2-(fluorosulfonyl)acetate (5) or methyl perfluoro [2-(fluorosulfonyl)ethoxy]acetate (6) in the presence of copper(I) iodide and by reaction of trimethyl(trifluoromethyl)silane (7) with fluoride and copper(I) iodide. ... 

Table 3.4 Thermal Stability of Perfluoroalkanoic Acids and Alkanoic Acids...

The pyrolysis of perfluoroalkanesulfonates proceeds by a different reaction mechanism than the pyrolysis of perfluoroalkanoates. Like its parent acid, potassium perfluorooctanesulfonate does not produce an olefin when heated but yields perfluoroalkanes of various chain lengths, SOo, K2SO4, and soot [13]. The thermal stability of perfluoroalkanesulfonates decreases in the order of their cations Ca" > > Na > Li > NH4 (Fig. 3.5) [13]. Calcium perfluorooctanesul-... 

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See also in sourсe #XX -- [ ]

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