tetrabutyl ammonium fluoride in tetrahydrofuran T=20°C; 3 h;

aluminium trichloride in dichloromethane T=-78°C; 3 h;

1: potassium hydroxide / methanol 2: triethylamine; bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide / 12 h / 20 °C / |Inert atmosphere View Scheme