pyridine; chloroformic acid ethyl ester in chloroform 48 h; Ambient temperature;

1: 90 percent / hydroxylamine hydrochloride, sodium acetate / aq. ethanol / 1 h / Heating 2: 90 percent / ethyl chloroformate, pyridine / CHCl3 / 48 h / Ambient temperature View Scheme

1: 88 percent / diphenyl ether / 0.25 h / Heating 2: 90 percent / hydroxylamine hydrochloride, sodium acetate / aq. ethanol / 1 h / Heating 3: 90 percent / ethyl chloroformate, pyridine / CHCl3 / 48 h / Ambient temperature View Scheme

1: 49 percent / 4 h / 130 °C 2: 88 percent / diphenyl ether / 0.25 h / Heating 3: 90 percent / hydroxylamine hydrochloride, sodium acetate / aq. ethanol / 1 h / Heating 4: 90 percent / ethyl chloroformate, pyridine / CHCl3 / 48 h / Ambient temperature View Scheme

1: 49 percent / 4 h / 130 °C 2: 88 percent / diphenyl ether / 0.25 h / Heating 3: 90 percent / hydroxylamine hydrochloride, sodium acetate / aq. ethanol / 1 h / Heating 4: 90 percent / ethyl chloroformate, pyridine / CHCl3 / 48 h / Ambient temperature View Scheme