lithium aluminium tetrahydride in diethyl ether 3 h; Heating;

1: 92 percent / LiAlH4 / diethyl ether / 3 h / Heating 2: 82 percent / NaOH / aq. ethanol / r.t., 30min., then reflux, 4h 3: 78 percent / polyphosphoric acid / 1.5 h / 190 - 200 °C 4: 71 percent / Se powder / 8 h / 300 °C View Scheme

1: 92 percent / LiAlH4 / diethyl ether / 3 h / Heating 2: 82 percent / NaOH / aq. ethanol / r.t., 30min., then reflux, 4h View Scheme