1: SOCl2 / Heating 2: 1.) Mg, iodine, cadmium chloride / 1.) ether, less than 10 deg C, 2 h, 2.) less 10 deg C, 6 h View Scheme

iodine; magnesium; cadmium (II) chloride 1.) ether, less than 10 deg C, 2 h, 2.) less 10 deg C, 6 h; Yield given. Multistep reaction;