1: 4-bromo-benzo[b]thiophene With iodine; magnesium in tetrahydrofuran T=50 - 55°C; 1.5 h; 2: carbon dioxide in tetrahydrofuran T=23°C; 0.25 - 0.333333 h; 3: With hydrogenchloride; water in tetrahydrofuran T=0°C;

hydrogenchloride; sodium hydroxide; sodium chloride; palladium monocarbide in water; nitrobenzene

Yield given. Multistep reaction;