sodium hydroxide in methanol 1 h; Heating;

1: concd HCl / methanol / 4 h / Heating 2: HCl / 2 h / Heating 3: 1.) a) 43percent HBF4, b) aq. NaNO2 / 1.) 0-5 deg C, a) 10 min, b) 20 min, 2.) 80-140 deg C, 0.5 h 4: 87 percent / aq. NaOH / methanol / 1 h / Heating View Scheme