sulfuric acid; hydrogen bromide 24 h; Heating;

1: 76 percent / tin(IV) chloride / CH2Cl2 / 1.5 h / Ambient temperature 2: 91 percent / 95percent hydrazine hydrate, potassium hydroxide / ethane-1,2-diol / 4.5 h / 60 °C / Heating 3: 85 percent / Raney nickel-aluminium alloy / aq. NaOH / 3 h / 90 - 120 °C 4: 93 percent / lithium aluminium hydride / diethyl ether / 1.) RT, 1.5 h, 2.) reflux, 1h 5: 94 percent / 48percent hydrobromic acid, sulfuric acid / 24 h / Heating View Scheme

1: 93 percent / lithium aluminium hydride / diethyl ether / 1.) RT, 1.5 h, 2.) reflux, 1h 2: 94 percent / 48percent hydrobromic acid, sulfuric acid / 24 h / Heating View Scheme

1: 76 percent / tin(IV) chloride / CH2Cl2 / 1.5 h / Ambient temperature 2: 91 percent / 95percent hydrazine hydrate, potassium hydroxide / ethane-1,2-diol / 4.5 h / 60 °C / Heating 3: 85 percent / Raney nickel-aluminium alloy / aq. NaOH / 3 h / 90 - 120 °C 4: 93 percent / lithium aluminium hydride / diethyl ether / 1.) RT, 1.5 h, 2.) reflux, 1h 5: 94 percent / 48percent hydrobromic acid, sulfuric acid / 24 h / Heating View Scheme

1: 85 percent / Raney nickel-aluminium alloy / aq. NaOH / 3 h / 90 - 120 °C 2: 93 percent / lithium aluminium hydride / diethyl ether / 1.) RT, 1.5 h, 2.) reflux, 1h 3: 94 percent / 48percent hydrobromic acid, sulfuric acid / 24 h / Heating View Scheme

1: 91 percent / 95percent hydrazine hydrate, potassium hydroxide / ethane-1,2-diol / 4.5 h / 60 °C / Heating 2: 85 percent / Raney nickel-aluminium alloy / aq. NaOH / 3 h / 90 - 120 °C 3: 93 percent / lithium aluminium hydride / diethyl ether / 1.) RT, 1.5 h, 2.) reflux, 1h 4: 94 percent / 48percent hydrobromic acid, sulfuric acid / 24 h / Heating View Scheme

1: Al2O3 / 350 °C 2: (i) B2H6, (ii) (heating), (iii) aq. H2O2, aq. NaOH 3: HBr / acetic acid View Scheme

1: (i) B2H6, (ii) (heating), (iii) aq. H2O2, aq. NaOH 2: HBr / acetic acid View Scheme

2: Al2O3 / 350 °C 3: (i) B2H6, (ii) (heating), (iii) aq. H2O2, aq. NaOH 4: HBr / acetic acid View Scheme

2: Al2O3 / 350 °C 3: (i) B2H6, (ii) (heating), (iii) aq. H2O2, aq. NaOH 4: HBr / acetic acid View Scheme