1: 56 percent / benzene / 20 h / 60 °C 2: t-butylhypochlorite / tetrahydrofuran 3: 80 percent / Et3N / tetrahydrofuran 4: H2O View Scheme

 in  benzene T=60°C; 20 h;   

Multi-step reaction with 3 steps 1: 56 percent / benzene / 20 h / 60 °C2: t-butylhypochlorite / tetrahydrofuran3: 80 percent / Et3N / tetrahydrofuran