1: 42 percent / Na2CO3 / 3 h / Heating 2: 86 percent / 3percent HCl / methanol / 2 h / Heating 3: 25percent NH3 / 360 h / Ambient temperature View Scheme

1: 86 percent / 3percent HCl / methanol / 2 h / Heating 2: 25percent NH3 / 360 h / Ambient temperature View Scheme

ammonium hydroxide 360 h; Ambient temperature;