1: With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.333333 h; Inert atmosphere; 2: With N-iodo-succinimide in tetrahydrofuran; hexane T=-78 - 20°C; Inert atmosphere; 3: With hydrogenchloride; water in tetrahydrofuran; hexane 2 h;