1: 84 percent / NBS, benzoyl peroxide / CCl4 / 3 h / Heating 2: dimethylformamide / Ambient temperature 3: Cs2CO3 / dimethylformamide / 60 °C 4: 15percent aq. H2SO4, SiO2 / CH2Cl2 5: TFA / 1 h / Ambient temperature 6: benzene / 1 h / Heating View Scheme

1: 84 percent / NBS, benzoyl peroxide / CCl4 / 3 h / Heating 2: dimethylformamide / Ambient temperature 3: Cs2CO3 / dimethylformamide / 60 °C 4: 15percent aq. H2SO4, SiO2 / CH2Cl2 5: TFA / 1 h / Ambient temperature 6: benzene / 1 h / Heating View Scheme

P(i-BuNCH2CH2)3N in toluene T=20°C; 1 h;