thionyl chloride 0.5 h;

1: 1) HCl; 2) NaHCO3 / 2) H2O 2: 93 percent / pyridine / Ambient temperature 3: 98 percent / m-chloroperbenzoic acid / CHCl3 / Ambient temperature 4: 98 percent / CHCl3 / 50 °C 5: 83 percent / CH3ONa / methanol 6: 91 percent / SOCl2 / 0.5 h View Scheme

1: 98 percent / m-chloroperbenzoic acid / CHCl3 / Ambient temperature 2: 98 percent / CHCl3 / 50 °C 3: 83 percent / CH3ONa / methanol 4: 91 percent / SOCl2 / 0.5 h View Scheme

1: 98 percent / CHCl3 / 50 °C 2: 83 percent / CH3ONa / methanol 3: 91 percent / SOCl2 / 0.5 h View Scheme

1: 83 percent / CH3ONa / methanol 2: 91 percent / SOCl2 / 0.5 h View Scheme

1: NaOEt / ethanol / overnight 2: 2 M HCl / 30 h / 50 °C 3: 1) DAPA, MnO2; 2) 0.3 M HCl / 1) benzene, pyridine, 3 h; 2) benzene, AcOEt, 40 min. View Scheme