Fluorinated aliphatic free radicals

Carboxylic acids react with xenon difluoride to produce unstable xenon esters The esters decarboxylate to produce free radical intermediates, which undergo fluorination or reaction with the solvent system Thus aliphatic acids decarboxylate to produce mainly fluoroalkanes or products from abstraction of hydrogen from the solvent Perfluoro acids decarboxylate in the presence of aromatic substrates to give perfluoroalkyl aromatics Aromatic and vinylic acids do not decarboxylate [91] (equation 51)... [Pg.161]

The halogenation of saturated aliphatic hydrocarbons is usually achieved by free radical processes. Ionic halogenation (fluorination, chlorination, and bromination) of alkanes has also been reported under superacid catalysis. Reactions may be carried out either in the liquid phase or in the gas phase over solid superacids or supported noble metal catalysts. High selectivity and relatively mild reaction conditions are the main features of these transformations. [Pg.328]