1: 63 percent / aq. KOH / methanol / Heating 2: 50 percent / Ac2O / Heating 3: 41 percent / diethyl ether / reflux, 2 h -> room temperature 4: 28 percent / KF, 18-crown-6-ether / acetonitrile / Heating View Scheme

1: 63 percent / aq. KOH / methanol / Heating 2: 50 percent / Ac2O / Heating 3: 41 percent / diethyl ether / reflux, 2 h -> room temperature 4: 28 percent / KF, 18-crown-6-ether / acetonitrile / Heating 5: 45 percent / Zn, NH4Cl / aq. ethanol / 5 h / 10 - 15 °C 6: 58 percent / 1 h / Heating View Scheme

potassium hydrogensulfate T=160 - 180°C;

trichlorophosphate in pyridine 8 h, room temp., 1.5 h steam bath;

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sodium hydride in methanol 2 h; Ambient temperature;