1: para-bromotoluene; 2-Bromo-1,3,5-trimethyl-benzene With magnesium in tetrahydrofuran 2 h; 2: 1,3-dichloro-2-iodobenzene in tetrahydrofuran Hart reaction; 3 h; Heating; 3: With iodine in tetrahydrofuran T=20°C;

iodine 1.) THF, reflux, 3 h; 2.) THF, CCl4, 1 h; Yield given. Multistep reaction;