1: (4-methoxybenzyl)triphenylphosphonium chloride With potassium tert-butylate in tetrahydrofuran 0.25 h; Heating; 2: [2,2';5',2'']terthiophene-3'-carboxyaldehyde in tetrahydrofuran Wittig reaction; 8 h; Heating;

1.1: 73 percent / aq. HBr; Br2 / 3 h / 50 °C 2.1: 76 percent / Na2CO3 / Pd(PPh3)4 / 1,2-dimethoxy-ethane / 13 h / Heating 3.1: t-BuOK / tetrahydrofuran / 0.25 h / Heating 3.2: 80 percent / tetrahydrofuran / 8 h / Heating View Scheme

1.1: 76 percent / Na2CO3 / Pd(PPh3)4 / 1,2-dimethoxy-ethane / 13 h / Heating 2.1: t-BuOK / tetrahydrofuran / 0.25 h / Heating 2.2: 80 percent / tetrahydrofuran / 8 h / Heating View Scheme

1.1: 95 percent / TFA / CHCl3; H2O / 1.5 h / 20 °C 2.1: t-BuOK / tetrahydrofuran / 0.25 h / Heating 2.2: 80 percent / tetrahydrofuran / 8 h / Heating View Scheme