pyridine in benzene

pyridine; oxalyl dichloride in benzene T=15°C; 0.5 h;

1: 90 percent / KOH / ethanol 2: oxalyl chloride, pyridine / benzene / 0.5 h / 15 °C View Scheme

1: PCl5, pyridine / CH2Cl2 / 1 h / Ambient temperature 2: hydrazoic acid / CH2Cl2; benzene / 1.) RT, 1 h, 2.) reflux, 5 h 3: 90 percent / KOH / ethanol 4: oxalyl chloride, pyridine / benzene / 0.5 h / 15 °C View Scheme

1: 62 percent / 6 h / 130 °C 2: 90 percent / KOH / ethanol 3: oxalyl chloride, pyridine / benzene / 0.5 h / 15 °C View Scheme