1: potassium carbonate / methanol; water / 2 h / 60 °C 2: oxalyl dichloride / dichloromethane / 1 h / 20 °C 3: sodium azide / water; acetone / 1 h / 0 °C 4: benzene / 1 h / Reflux 5: dichloromethane / 2 h / 20 °C 6: sodium hydride / tetrahydrofuran / 1 h / 0 °C 7: N-bromosuccinmide; 2,2'-azo-bisisobutyronitrile / benzene / 5 h / 70 °C 8: potassium tert-butylate / tert-butyl alcohol / 0.25 h / 70 - 85 °C View Scheme

sodium hydride in tetrahydrofuran; oil 1 h; Reflux;