1: (i) aq. Ba(OH)2, (ii) /BRN= 1098367/, (iii) /BRN= 1098229/, H2SO4 2: LiBH4 / tetrahydrofuran / 3.5 h / Heating 3: HBr / acetic acid / 0.5 h / 100 °C 4: (i) Na, (ii) /BRN= 4047078/, (iii) aq. Ba(OH)2, MeOH View Scheme

1: (i) aq. Ba(OH)2, (ii) /BRN= 1098367/, (iii) /BRN= 1098229/, H2SO4 2: LiBH4 / tetrahydrofuran / 3.5 h / Heating 3: HBr / acetic acid / 0.5 h / 100 °C 4: (i) Na, (ii) /BRN= 4047078/, (iii) aq. Ba(OH)2, MeOH 5: aq. NaOH / 0.5 h / 180 °C View Scheme