1.1: 1,3-bis[(2,4,6-tribromo)phenyl]imidazolinium chloride; oxygen / tetrahydrofuran / 3 h / 60 °C 2.1: potassium hydroxide / water / 70 °C 3.1: ammonia / water 3.2: 13 h / 40 °C / 3750.38 Torr / |Autoclave View Scheme

With  oxygen in  methanol T=60°C; P=15001.5 Torr; 6 h;  Reagent/catalystPressureSolventTemperatureTime;  Show Experimental Procedure