AlCl3, aluminium chloride in dichlorobenzene, 1,2- T=20 - 25°C; 1.66667 h;

T=100°C; 7.5 h;

acetic anhydride

1: 30percent H2O2, glacial acetic acid / 18 h / 80 °C 2: 67 percent / acetic anhydride / 18 h / 75 °C View Scheme

1: 3-chloro-benzenecarboperoxoic acid / dichloromethane / 2 h / 20 °C / Cooling with ice 2: 2.5 h / 70 °C / Cooling with ice View Scheme

1.1: AlCl3, aluminium chloride / anhydrous dichloroethane / 3 h / 80 °C / Cooling with ice 1.2: 20 °C 2.1: potassium carbonate / N,N-dimethyl-formamide / 2 h / 20 °C 3.1: pyridinium tribromide / tetrahydrofuran / 0 °C / Reflux 4.1: (R)-tetrahydro-1-methyl-3,3-diphenyl-1H,3H-pyrrolo[1,2-c]-[1,3,2]oxazaborole / tetrahydrofuran / 0.67 h / -55 - -45 °C / Inert atmosphere 4.2: -45 - 0 °C / Inert atmosphere 4.3: 20 °C View Scheme

1.1: AlCl3, aluminium chloride / anhydrous dichloroethane / 3 h / 80 °C / Cooling with ice 1.2: 20 °C 2.1: potassium carbonate / N,N-dimethyl-formamide / 2 h / 20 °C View Scheme

1: With hydrogenchloride; AlCl3, aluminium chloride in 1,2-dichloro-ethane T=0 - 85°C; 1.5 h; 2: With hydrogenchloride in water T=0°C; 2 h;

AlCl3, aluminium chloride in dichlorobenzene, 1,2- T=80°C; 1 h;

T=80°C; 1 h;