1: 95 percent / HCl conc. / 14 h / Heating 2: 97 percent / methanol / 4 h / Ambient temperature 3: 0.10 g / methanol / 1 h / Ambient temperature 4: 95 percent / aq. NaOH / 1.5 h / Ambient temperature View Scheme

ammonium hydroxide Heating;