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;
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