1: 65 percent / NaH / dimethylformamide / 6 h / Ambient temperature 2: 2.) 48percent aq. HBr, Fe / 1.) DMF, reflux, 2 h, 2.) ethanol, reflux, 4.5 h View Scheme

hydrogen bromide; iron 1.) DMF, reflux, 2 h, 2.) ethanol, reflux, 4.5 h; Yield given. Multistep reaction;