Selective Electrochemical Synthesis of the <i>para,para</i> C–C Dimer from Diphenylphenol and Its Conversion into Dibenzofuran

The selective formation of the <i>para,para</i> carbon-carbon dimer tetraphenyl dibenzoquinone from diphenylphenol is reported under electrochemical conditions and variable potential. The dibenzoquinone dimer was converted into its reduced state and dibenzofurans, at room temperature, a process that was controlled by electricity and light.