1: 35 percent / Zn dust, aq. NaOH / ethanol / 4 h / Heating 2: 64 percent / 10percent aq. HCl / 5 h / Heating 3: 1.) 10percent aq. H2SO4, NaNO2, 2.) CuBr, 48percent aq. HBr / 1.) 10 deg C, 30 min, 2.) 50 deg C, 3 h View Scheme

sulfuric acid; hydrogen bromide; copper(I) bromide; sodium nitrite 1.) 10 deg C, 30 min, 2.) 50 deg C, 3 h; Yield given. Multistep reaction;

1: 64 percent / 10percent aq. HCl / 5 h / Heating 2: 1.) 10percent aq. H2SO4, NaNO2, 2.) CuBr, 48percent aq. HBr / 1.) 10 deg C, 30 min, 2.) 50 deg C, 3 h View Scheme