Synthesis of 2,2′-Bis(silyl)azobenzenes by Oxidation of 2-(Silyl)anilines

A method was developed for the synthesis of 2,2′-bis(trimethylsilyl)- and 2,2′-bis(triethoxysilyl)-azobenzenes based on oxidation of 2-(silyl)anilines with trimethylamine and N-methylmorpholine oxides in the presence of CuX (X = Cl, Br).