tin(ll) chloride in ethanol T=70°C; 2 h;

1: 92 percent / Co(OAc)2*4H2O, Mn(OAc)2*4H2O, tert-butyl peroxide, 48percent HBr, O2 / acetic acid / 3 h / 130 - 160 °C / 15514.4 Torr 2: 83 percent / fuming HNO3, conc. H2SO4 / 0 deg C, 1 h then 50 deg C, 1.5 h 3: 93 percent / B2H6 / tetrahydrofuran / 1.5 h / Heating 4: 68 percent / SnCl2*2H2O / ethanol / 2 h / 70 °C View Scheme

1: 83 percent / fuming HNO3, conc. H2SO4 / 0 deg C, 1 h then 50 deg C, 1.5 h 2: 93 percent / B2H6 / tetrahydrofuran / 1.5 h / Heating 3: 68 percent / SnCl2*2H2O / ethanol / 2 h / 70 °C View Scheme

1: 93 percent / B2H6 / tetrahydrofuran / 1.5 h / Heating 2: 68 percent / SnCl2*2H2O / ethanol / 2 h / 70 °C View Scheme