title: Efficient oxidative coupling of 2,6-disubstituted phenol catalyzed by a dicopper(II) complex.
abstract: Complexation of a rigid multi-pyridine ligand bis(2-pyridyl)-1,8-naphthyridine (bpnp) with [Cu(2)(TFA)(4)] (TFA = trifluoroacetate) resulted in the formation of a dinuclear copper(II) complex, namely [Cu(2)(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.
authors: Department of Chemistry, National Taiwan University, Taipei, Taiwan 106, ROC.
authors: Bei-Sih
authors: BS
authors: Liao
authors: Yi-Hung
authors: YH
authors: Liu
authors: Shei-Ming
authors: SM
authors: Peng
authors: Shiuh-Tzung
authors: ST
authors: Liu