1: SOCl2, DMF / 1,2-dichloro-ethane / Heating 2: Mg(OEt)2 / diethyl ether / 0.33 h / Heating 3: concd. H2SO4 / acetic acid; H2O / 2 h / Heating View Scheme

hydrogenchloride; thionyl chloride; sulfuric acid; water; acetic acid; N,N-dimethyl-formamide 1.) 1 h, reflux, 2.) Et2O; 20 min, reflux, 3.) 2 h, reflux; Yield given. Multistep reaction;