1: 68 percent / diborane / tetrahydrofuran / a) RT, 1 h, b) reflux, 90 min 2: 78 percent / CH2Cl2 / Ambient temperature 3: 74 percent / KOH / aq. ethanol / 5 h / Heating View Scheme

potassium hydroxide in ethanol 5 h; Heating;

diborane in tetrahydrofuran a) RT, 1 h, b) reflux, 90 min;

1: 68 percent / diborane / tetrahydrofuran / a) RT, 1 h, b) reflux, 90 min 2: 97 percent / KOH / aq. ethanol / 5 h / Heating View Scheme