1: 95 percent / oxychlorure de phosphore / toluene / 2 h / Heating 2: 93 percent / 30percent Pd/C / decahydronaphthalene / 2 h / Heating 3: 70 percent / selenic anhydride / dioxane / 3 h / Heating 4: 2.) sodium borohydride / 1.) ethanol, reflux, 18 h, 2.) ethanol, room temperature, 30 min View Scheme

1: 70 percent / selenic anhydride / dioxane / 3 h / Heating 2: 2.) sodium borohydride / 1.) ethanol, reflux, 18 h, 2.) ethanol, room temperature, 30 min View Scheme

sodium tetrahydroborate 1.) ethanol, reflux, 18 h, 2.) ethanol, room temperature, 30 min; Yield given. Multistep reaction;