in pyridine 0.166667 h;

1: 90.5 percent / hydroxylamine hydrochloride, sodium hydroxide / H2O / 6 h / Heating 2: sodium 3: 76 percent / pyridine / 0.17 h View Scheme

1: sodium 2: 76 percent / pyridine / 0.17 h View Scheme

1: 1) sodium dichromate, 98 percent sulphuric acid; 2) phthalic anhydride / 1) ether, water, 25-35 deg C, 2 h; 2) 100 deg C, 12 h 2: 90.5 percent / hydroxylamine hydrochloride, sodium hydroxide / H2O / 6 h / Heating 3: sodium 4: 76 percent / pyridine / 0.17 h View Scheme