sodium hydroxide; tetraethylene glycol T=180°C;

1: 83 percent / LiAlH4 / diethyl ether; tetrahydrofuran / 1) 2 h, reflux, 2) 12 h, r.t. 2: 80 percent / 47percent aq. HBr / H2SO4 / 20 h / Heating 3: 66 percent / NaOH, tetraethyleneglycol / 180 °C View Scheme

1: 80 percent / 47percent aq. HBr / H2SO4 / 20 h / Heating 2: 66 percent / NaOH, tetraethyleneglycol / 180 °C View Scheme