Journal
JOURNAL OF FLUORINE CHEMISTRY
Volume 130, Issue 10, Pages 926-932Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jfluchem.2009.07.010
Keywords
Perfluoroalkyl iodide; Perfluoroalkylation; Titanium oxide; Photocatalyst; Radical
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Funding
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of the Japanese Government
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Photoirradiation of titanium oxide (TiO2) excites the electrons from the valence band to the conduction band, leaving holes in the valence band. Using these holes and electrons, it is possible to perform one-electron oxidations and reductions. We developed a method for the photocatalytic perfluoroalkylation of aromatic rings such as benzene and its derivatives, naphthalene and benzofuran with perfluoroalkyl iodide by the combination of reduction and oxidation reactions with TiO2. Perfluoroalkyl iodide was reduced to a perfluoroalkyl radical by the excited electrons in the conduction band of TiO2, and the resulting radical reacted with an aromatic ring to form an arenium radical that was successively oxidized to a cation by the holes in the valence band of TiO2. Similarly, the photocatalytic reaction of alpha-methylstyrene with perfluoroalkyl iodide afforded perfluoroalkylated alpha-methylstyrene, in which the perfluoroalkyl group is on a methyl carbon. (C) 2009 Elsevier B.V. All rights reserved.
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