1: 96 percent / conc. hydrochloric acid / Ambient temperature 2: 1.) NaH / 1.) THF, room temp., 1 h, 2.) reflux, 6 h View Scheme

sodium hydride 1.) THF, room temp., 1 h, 2.) reflux, 6 h; Multistep reaction;

1: NaOH / H2O / 10 h / Heating 2: conc. hydrochloric acid / Ambient temperature 3: 93 percent / potassium persulphate, conc. sulfuric acid / H2O; methanol / 3 h / 5 °C 4: 68 percent / pyridinium chlorochromate / CH2Cl2 / 1 h / Ambient temperature View Scheme

1: NaOH / H2O / 10 h / Heating 2: conc. hydrochloric acid / Ambient temperature View Scheme