1-A2 3-Bromcyclohexen aus Cyclohexen Start Propagation: NC HBr HBr Br-N1-A2 3-Bromcyclohexen aus Cyclohexen 1-A2 Br NBS CCl4 ,AiBN, D Start: NC N N CN 2 NC +N2 ∆ Propagation: NC + Br N O O Br N O NC O N O NC O + B r + Br H HBr + HBr + Br N O O ionisch, rasch Br Br + H N O O + Br Br Br + Br