1: H2SO4 / H2O / 2 h / Ambient temperature 2: HCl gas / Heating 3: 90 percent / 18 h / Ambient temperature 4: 50 percent / MnO2 / various solvent(s) / 72 h / Ambient temperature View Scheme

1: HCl gas / Heating 2: 90 percent / 18 h / Ambient temperature 3: 50 percent / MnO2 / various solvent(s) / 72 h / Ambient temperature View Scheme

1: 90 percent / 18 h / Ambient temperature 2: 50 percent / MnO2 / various solvent(s) / 72 h / Ambient temperature View Scheme

sodium hydride 1.) dimethoxyethane, room temp., 2 h, 2.) dimethylformamide, room temp.,; Multistep reaction;