1: 34 percent / Na2CO3*10 H2O, tetrabutylammonium bromide / H2O; CH2Cl2 / 1 h / Ambient temperature 2: 93 percent / p-toluenesulfonic acid / methanol / 3 h / Heating View Scheme

NiO2; oxygen in benzene 0.5 h; Ambient temperature; Yields of byproduct given;