PPA in water; acetone T=50°C; 23 h;

1: 70 percent / hydroxylamine hydrochloride, sodium bicarbonate / H2O / 24 h 2: 46 percent 3: H2 / Ra-Ni / aq. ethanol / 4 h / Ambient temperature 4: 70 percent / sodium acetate / acetic anhydride / 1.25 h / 100 °C 5: 68 percent / polyphosphoric acid / acetone; H2O / 23 h / 50 °C View Scheme

1: 46 percent 2: H2 / Ra-Ni / aq. ethanol / 4 h / Ambient temperature 3: 70 percent / sodium acetate / acetic anhydride / 1.25 h / 100 °C 4: 68 percent / polyphosphoric acid / acetone; H2O / 23 h / 50 °C View Scheme

1: H2 / Ra-Ni / aq. ethanol / 4 h / Ambient temperature 2: 70 percent / sodium acetate / acetic anhydride / 1.25 h / 100 °C 3: 68 percent / polyphosphoric acid / acetone; H2O / 23 h / 50 °C View Scheme

1: 70 percent / sodium acetate / acetic anhydride / 1.25 h / 100 °C 2: 68 percent / polyphosphoric acid / acetone; H2O / 23 h / 50 °C View Scheme