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

1: With triethylamine; bis-triphenylphosphine-palladium(II) chloride; copper(l) iodide 5 h; Heating / reflux; 2: With methanol; potassium hydroxide; water 1 h; 3: With hydrogenchloride; potassium carbonate more than 3 stages;

tetrabutyl ammonium fluoride in tetrahydrofuran T=20°C; 0.166667 h;