in ethanol 0.5 h;

Multi-step reaction with 3 steps 1: 1.) NaOH; 2.) cc. HCl / 1.) water, boiling, 2 h; 2.) 0 deg C2: 60 percent / PCl5 / benzene3: 81 percent / pyridine / benzene / 0.5 h, 20 degC; 1 h, 50 degC