aluminium trichloride in dichloromethane T=-78°C; 1 h;

1: 67 percent / NBS, (CH3)2S / CH2Cl2 / 2.5 h / 0 °C 2: 1.) Zn, 1,2-dibromoethane, finelly crushed glass 2.) HCl / 1.) THF, 45-50 gradC: 2.) acidic hidrolysis View Scheme

hydrogenchloride; finelly crushed glass; ethylene dibromide; zinc 1.) THF, 45-50 gradC: 2.) acidic hidrolysis; Yield given. Multistep reaction;