Aromatic Hydroxylation Reactivity of a Mononuclear Cu(II)-Alkylperoxo Complex
Kunishita, A.; Teraoka, J.; Scanlon, J. D.; Matsumoto, T.; Suzuki, M.;
Cramer, C. J.; Itoh, S.
J. Am. Chem. Soc. 2007, 129, 7248.
Reaction of copper(II) complex 1X supported by the tridentate bis(pyridylmethyl)amine ligand containing m-substituted phenyl groups at the 6-positions of the pyridine rings (LX) with H2O2 in the presence of triethylamine (NEt3) in acetone generates a copper(II)-alkylperoxo species 2X [2-hydroxy-2-hydroperoxypropane (HHPP) adduct]. The alkylperoxo intermediate 2X undergoes an efficient aromatic ligand hydroxylation reaction, producing a phenolate complex 4X via another intermediate 3X. Kinetic studies on the aromatic hydroxylation process are reported together with spectral characterization of 2X.
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