1: With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran; hexane T=-75°C; 2 h; 2: With iodine in tetrahydrofuran; hexane T=-75°C; 2 h;

1: With sulfuric acid; water 1 h; Heating / reflux; 2: With sodium hydroxide; sodium hydrogencarbonate in water T=20°C;