1,3,5-trishydroxybenzene; sodium nitrite in N,N-dimethyl-formamide Ambient temperature;

1: thionyl chloride / 2 h / 80 °C 2: bromine / 14 h / 80 °C 3: 20 °C / Cooling with ice; Reflux 4: 1,3,5-trishydroxybenzene; sodium nitrite / N,N-dimethyl-formamide / 2.5 h / 20 °C View Scheme

1: bromine / 14 h / 80 °C 2: 20 °C / Cooling with ice; Reflux 3: 1,3,5-trishydroxybenzene; sodium nitrite / N,N-dimethyl-formamide / 2.5 h / 20 °C View Scheme