m-perbenzoic acid in dichloromethane 12 h;

hydrogenchloride in methanol T=65°C; 6 h;

1: 67 percent / HCl / methanol / 6 h / 65 °C 2: 85 percent / tetraethylammonium perchlorate / 4 h / Ambient temperature; platinum foil electrodes (18.7 mA/cm2) View Scheme

1: 67 percent / HCl / methanol / 6 h / 65 °C 2: 85 percent / tetraethylammonium perchlorate / 4 h / Ambient temperature; platinum foil electrodes (18.7 mA/cm2) 3: 2.) Na2CO3 / 1.) Amberllite 122 (acidic form) / 1.) dioxan, H2O, r.t., 3 h, 2.) reflux, 6 h View Scheme