1: 1.) Mg / 1.) ether, 2.) ether, toluene, reflux, 30 min 2: aq. H2SO4, CH3COOH / 24 h / Heating View Scheme

1: 1.) Mg / 1.) ether, 2.) ether, toluene, reflux, 30 min 2: aq. H2SO4, CH3COOH / 24 h / Heating 3: 91 percent / polyphosphoric acid (PPA) / 2 h / 100 °C 4: 76 percent / sodium borohydride / methanol / 1 h / Ambient temperature 5: SOCl2 / toluene / 1.) RT, 30 min, 2.) from 50 deg C to 55 deg C, 1 h 6: butan-2-one / 16 h / Heating View Scheme

1: ethanol / water / 1.5 h / |Reflux 2: hydrogenchloride / water / |Reflux View Scheme