1: conc. HCl / methanol / 23 h / Ambient temperature 2: 88 percent / Adogen 464, Fremy's salt, KH2PO4 / H2O; benzene / 0.5 h View Scheme

1: conc. HCl / methanol / 23 h / Ambient temperature 2: 88 percent / Adogen 464, Fremy's salt, KH2PO4 / H2O; benzene / 0.5 h 3: 79 percent / NaBH4 / ethanol 4: m-CPBA / CH2Cl2 / 1 h / Ambient temperature View Scheme

1: conc. HCl / methanol / 23 h / Ambient temperature 2: 88 percent / Adogen 464, Fremy's salt, KH2PO4 / H2O; benzene / 0.5 h 3: 79 percent / NaBH4 / ethanol View Scheme

hydrogenchloride in methanol 23 h; Ambient temperature;