One-Step Selective Hydroxylation of Benzene to Phenol with Hydrogen Peroxide Catalysed by Copper Complexes Incorporated into Mesoporous Silica-Alumina.

ABSTRACT: Benzene was hydroxylated with hydrogen peroxide (H₂O₂) in the presence of catalytic amounts of copper complexes in acetone to yield phenol at 298 K. At higher temperature, phenol was further hydroxylated with H₂O₂ by catalysis of copper complexes to yield p-benzoquinone. The kinetic study revealed that the rate was proportional to concentrations of benzene and H₂O₂, but to the square root of concentration of a copper(II) complex ([Cu(tmpa)]²⁺: tmpa = tris(2-pyridylmethyl)amine). The addition of a spin trapping reagent resulted in formation of a spin adduct of hydroperoxyl radical (HO₂^•), as observed by EPR spectroscopy, inhibiting phenol formation. HO₂^• produced b

SUBMITTER: Yamada M 

PROVIDER: S-EPMC4951108 | biostudies-literature | 2016 Apr

REPOSITORIES: biostudies-literature