hydroquinone

di-tert-butyl peroxide; [Cl2NN]Cu T=20°C; 16 h; Product distribution / selectivity;

1: 98 percent / p-toluenesulfonic acid (p-TsOH) / CHCl3 / 0.17 h / Heating 2: 1) ZnBr2 / 1) diethylether, a) room temp., 2 h, b) reflux, 2) toluene, reflux, 4d View Scheme

zinc dibromide 1) diethylether, a) room temp., 2 h, b) reflux, 2) toluene, reflux, 4d; Yield given. Multistep reaction;