1: 54.5 percent / 47 percent HBr / 7 h / 168 - 171 °C 2: 70 percent / Et3N / toluene / 6 h / Heating 3: 73 percent / 2 N HCl / 5 h / Heating 4: 1.) LiAlH4, 2.) aq. NaOH / 1.) Et2O, reflux, 3 h, 2.) Et2O, RT, 30 min View Scheme

1: 70 percent / Et3N / toluene / 6 h / Heating 2: 73 percent / 2 N HCl / 5 h / Heating 3: 1.) LiAlH4, 2.) aq. NaOH / 1.) Et2O, reflux, 3 h, 2.) Et2O, RT, 30 min View Scheme

sodium hydroxide; lithium aluminium tetrahydride 1.) Et2O, reflux, 3 h, 2.) Et2O, RT, 30 min; Multistep reaction;

1: 73 percent / 2 N HCl / 5 h / Heating 2: 1.) LiAlH4, 2.) aq. NaOH / 1.) Et2O, reflux, 3 h, 2.) Et2O, RT, 30 min View Scheme