pyridine in benzene T=5 - 20°C; 2 h;

1: sodium periodate / H2O / 3 h / Ambient temperature; pH to 7 2: 1.) sodium borohydride, acetic acid, 2.) trifluoroacetic anhydride, pyridine / 1.) 50percent aqueous methanol, pH to 8, 3 h, 2.) 2 h, 3.) methanol, reflux, 1 h 3: 78.6 percent / pyridine / benzene / 2 h / 5 - 20 °C View Scheme

sulfuric acid in acetic acid 15 h; Ambient temperature;