1: With sodium hydroxide in methanol; water 2.25 h; Heating / reflux; 2: With sodium tetrahydroborate in methanol; water T=20 - 35°C; 49.44 h; 3: With hydrogenchloride in methanol; water; acetone T=-12°C; 1.41667 h;

hydrogenchloride; sodium hydroxide; sodium borohydride in methanol; water; ethyl acetate