1: 71 percent / fuming HNO3, concd H2SO4 / 1 h / 55 °C 2: 59 percent / H2, NaOH / 10percent Pd/C / ethanol 3: 59 percent / xylene / 24 h / Heating 4: 30percent HBr, AcOH / 120 h / 100 °C View Scheme

1: 59 percent / H2, NaOH / 10percent Pd/C / ethanol 2: 59 percent / xylene / 24 h / Heating 3: 30percent HBr, AcOH / 120 h / 100 °C View Scheme

hydrogen bromide; acetic acid T=100°C; 120 h;

1: 59 percent / xylene / 24 h / Heating 2: 30percent HBr, AcOH / 120 h / 100 °C View Scheme