sodium hydroxide; sodium hydrogencarbonate; acetic acid; sodium nitrite in sulfuric acid; water; benzene

hydrogenchloride; copper(l) chloride; sodium nitrite 1) H2O, 0 - 5 degC, 20 min., 2) toluene, pH 6.5 (adding Na2CO3), a) 0 degC, 30 min, b) r.t, 12 h; Yield given. Multistep reaction;