1: 82 percent / LiEt3BH / tetrahydrofuran / 15 h / Ambient temperature 2: 90.3 percent / Br2 / 4 h / Heating 3: 91.6 percent / Heating 4: NaOH / bis-(2-hydroxy-ethyl) ether / Heating View Scheme

1: 82 percent / LiEt3BH / tetrahydrofuran / 15 h / Ambient temperature 2: 90.3 percent / Br2 / 4 h / Heating View Scheme

lithium triethylborohydride in tetrahydrofuran 15 h; Ambient temperature;