1: With hydrazine in ethanol T=0 - 20°C; 2.5 h; 2: With acetic acid; sodium nitrite in ethanol; water 1 h; 3: With sodium hydrogencarbonate in ethanol; water

bromine; acetic acid T=17°C; 24 h;

sulfuric acid; dihydrogen peroxide; iron(II) sulfate in dichloromethane; water T=-5 - 0°C; investigation of the influence of various reaction conditions; Product distribution;

1: 71 percent / dimethylformamide / 9 h / 110 °C 2: 83 percent / NH4OAc / ethanol / 48 h / Heating View Scheme