bromine in dichloromethane T=25°C; 1 h;

bromine in dichloromethane T=25°C;

copper(ll) bromide in acetonitrile Heating;

1: dichloromethane / 4 h / 20 °C / |Inert atmosphere 2: iodine cloride / dichloromethane / 3 h / -40 °C / |Inert atmosphere 3: sodium acetate; bis-triphenylphosphine-palladium(II) chloride / N,N-dimethyl acetamide / 12 h / 140 °C / |Inert atmosphere View Scheme

1: iodine / dichloromethane 2: tetrabutyl ammonium fluoride / tetrahydrofuran View Scheme

tetrabutyl ammonium fluoride in tetrahydrofuran T=20°C; 0.5 h;