1.1: aq. NaOH 2.1: 89 percent / Zn; AcOH 3.1: 79 percent / NBS; AIBN / CCl4 4.1: BuLi / tetrahydrofuran; hexane / 0.5 h / -78 °C 4.2: 70 percent / tetrahydrofuran; hexane / 1 h / -78 °C 5.1: 71 percent / DBU / tetrahydrofuran / 5 h / 20 °C View Scheme

1: aq. NaOH 2: 89 percent / Zn; AcOH View Scheme

sodium hydroxide in water T=20°C; 12 h;

N-bromosuccinmide; meta-chloroperoxybenzoic acid in tetrachloromethane 4 h; Heating;

1: 3-methyl-2-butenoic acid With N-bromosuccinmide in tetrachloromethane T=60°C; 3 h; 2: dibenzoyl peroxide in tetrachloromethane T=60°C; 6 h;