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  • Title: Electrochemical radiofluorination. Part 2. Anodic monofluorination of substituted benzenes using [18F]fluoride.
    Author: Reischl G, Kienzle GJ, Machulla HJ.
    Journal: Appl Radiat Isot; 2003 Jun; 58(6):679-83. PubMed ID: 12798377.
    Abstract:
    Electrochemical fluorination of various monosubstituted aromatic compounds was performed with [18F]fluoride using potentiostatic anodic oxidation on platinum electrodes in an undivided cell in acetonitrile with a mixture of Et(3)N.3HF/Et(3)N.HCl as electrolyte. Maximum radiochemical yields were obtained after a charge of 50C passed the solution. The results showed a clear dependence of the radiochemical yields on the oxidation potentials E(1/2) of the substrates as a consequence of different substituents namely CH(3)CO-, F-, Cl-, Br- and tert.-Butyl. With increasing E(1/2), the fluorination yields decreased from 7.9% (tert.-butylbenzene) to 1.5% (acetophenone). The ratio between F-for-X substitution and F-for-H substitution correlated with the bond energies of the C-X bond. With higher bond energies, less X-substitution was observed.
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