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Issue 4, 2012
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Efficient oxidative coupling of 2,6-disubstituted phenol catalyzed by a dicopper(II) complex

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Abstract

Complexation of a rigid multi-pyridine ligand bis(2-pyridyl)-1,8-naphthyridine (bpnp) with [Cu2(TFA)4] (TFA = trifluoroacetate) resulted in the formation of a dinuclear copper(II) complex, namely [Cu2(bpnp)(μ-OH)(TFA)3] (1). This complex has been characterized by X-ray crystallographic, spectroscopic and elemental analyses. Complex 1 is an efficient catalyst for the oxidative coupling of various 2,6-disubstituted phenols with molecular oxygen. Yields and selectivity depend on the reaction conditions employed, the best results being obtained in isopropanol or dioxane at 90 °C with yields of >99%. Mechanistic pathway of the catalysis is discussed.

Graphical abstract: Efficient oxidative coupling of 2,6-disubstituted phenol catalyzed by a dicopper(ii) complex

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Publication details

The article was received on 07 Jun 2011, accepted on 06 Oct 2011 and first published on 24 Nov 2011


Article type: Paper
DOI: 10.1039/C1DT11065A
Citation: Dalton Trans., 2012,41, 1158-1164
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    Efficient oxidative coupling of 2,6-disubstituted phenol catalyzed by a dicopper(II) complex

    B. Liao, Y. Liu, S. Peng and S. Liu, Dalton Trans., 2012, 41, 1158
    DOI: 10.1039/C1DT11065A

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