1.1: 5.37 g / nBuLi / tetrahydrofuran; hexane / 5 h / -78 °C 2.1: HCl / tetrahydrofuran; H2O / 2 h / 20 °C 2.2: 71 percent / HCl / ethyl acetate / 3 h / 0 °C 3.1: 96 percent / NaOH / ethanol; H2O / 1 h / 40 °C View Scheme

With  N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile in  tetrachloromethane 2.5 h;  Heating;