A new catalytic oxidation of diarylmethanes mediated by 2,2′,3,3′,5,5′-hexaphenyl-(1,1′-biphenyl)-4,4′-dioxyl

Abstract

Diarylmethanes were catalytically oxidized with oxygen to benzophenones with a Cu(I)Cl catalyst in butyronitrile as solvent in the presence of the mediating agent 2,2′,3,3′,5,5′-hexaphenyl-(1,1′-biphenyl)-4,4′-dioxyl 1, which was generated in situ from 2,2′,3,3′,5,5′-hexaphenyl-(1,1′-biphenyl)-4,4′-diol 4.