potassium carbonate; bis(dibenzylideneacetone)-palladium(0); 3-(2,6-diisopropylphenyl)-1-(2-diphenylphosphanylbenzyl)-3H-imidazol-1-ium chloride in N,N-dimethyl acetamide T=140°C; Heck reaction; 12 h;

palladium (II) trifluoroacetate; copper diacetate in 1,2-dichloro-ethane T=100°C; 2 h;

1: 86 percent / xylene / 18 h / Heating 2: 1) t-BuOK, 2) I2 / 1) EtOH, 1 h, 2) toluene, reflux View Scheme

1: 86 percent / xylene / 18 h / Heating 2: 1) t-BuOK, 2) I2 / 1) EtOH, 1 h, 2) toluene, reflux View Scheme

potassium tert-butylate; iodine 1) EtOH, 1 h, 2) toluene, reflux; Yield given. Multistep reaction;