1: With hydroxylamine-o-sulphonic acid in water T=90°C; 0.75 h; 2: With potassium carbonate in water 3: With hydrogen iodide in ethanol; water 0.333333 h; Cooling with ice-salt;

potassium carbonate in water; ethyl acetate T=20°C; 9 h; Heating / reflux; Product distribution / selectivity;

potassium carbonate in chloroform Ambient temperature;

1: 59 percent / aq. KOH / ethanol / 1 h / Ambient temperature 2: CHCl3 / 0.33 h / Ambient temperature 3: 50 percent / K2CO3 / CHCl3 / 72 h / Ambient temperature View Scheme