pyridine; copper(II) sulfate in N,N-dimethyl-formamide Heating;

1: 1.) SOCl2 / 1) C6H6, reflux, 1 h, 2) C6H6, 1 h 2: 37 percent / CuSO4, pyridine / dimethylformamide / Heating View Scheme

1: 86 percent / 2 mol/l NaOH / diethyl ether / 6 h / Ambient temperature 2: 1.) SOCl2 / 1) C6H6, reflux, 1 h, 2) C6H6, 1 h 3: 37 percent / CuSO4, pyridine / dimethylformamide / Heating View Scheme

1: 1.) SOCl2 / 1) C6H6, reflux, 1 h, 2) C6H6, 1 h 2: 37 percent / CuSO4, pyridine / dimethylformamide / Heating View Scheme