hydrogen; nickel in methanol P=2327.2 Torr;

pyridine; pyridin-2-yl hydrobromide 3 h; Heating;

1: 77 percent / CuSO4, H2SO4 / 18 h / Ambient temperature 2: 86 percent / 0.2percent HCl / 6 h / Ambient temperature 3: 91 percent / pyridine / 5 h 4: 1.) AcOH, Ac2O, H2SO4, 2.) SnCl4, 3.) MeONa 5: 55 percent / PhOCO2Ph, NaHCO3 / 4 h / 140 - 150 °C 6: 85 percent / pyridinium bromide, pyridine / 3 h / Heating View Scheme

1: 1.) AcOH, Ac2O, H2SO4, 2.) SnCl4, 3.) MeONa 2: 55 percent / PhOCO2Ph, NaHCO3 / 4 h / 140 - 150 °C 3: 85 percent / pyridinium bromide, pyridine / 3 h / Heating View Scheme

1: 91 percent / pyridine / 5 h 2: 1.) AcOH, Ac2O, H2SO4, 2.) SnCl4, 3.) MeONa 3: 55 percent / PhOCO2Ph, NaHCO3 / 4 h / 140 - 150 °C 4: 85 percent / pyridinium bromide, pyridine / 3 h / Heating View Scheme

1: 86 percent / 0.2percent HCl / 6 h / Ambient temperature 2: 91 percent / pyridine / 5 h 3: 1.) AcOH, Ac2O, H2SO4, 2.) SnCl4, 3.) MeONa 4: 55 percent / PhOCO2Ph, NaHCO3 / 4 h / 140 - 150 °C 5: 85 percent / pyridinium bromide, pyridine / 3 h / Heating View Scheme

1: 55 percent / PhOCO2Ph, NaHCO3 / 4 h / 140 - 150 °C 2: 85 percent / pyridinium bromide, pyridine / 3 h / Heating View Scheme