1.1: 84 percent / DOWEX X50-H(+) / methanol / 10 h / Heating 2.1: sodium hydride / diethyl ether / 1.5 h / 25 °C 2.2: 78 percent Chromat. / diethyl ether / 1.58 h View Scheme

1.1: 84 percent / DOWEX X50-H(+) / methanol / 10 h / Heating 2.1: sodium hydride / diethyl ether / 1.5 h / 25 °C 2.2: 78 percent Chromat. / diethyl ether / 1.58 h 3.1: 60 percent / hydrazine monohydrate / ethanol / 0.5 h / Heating View Scheme