1: With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 0.5 h; Inert atmosphere; 2: With tri-isopropoxy-borane in tetrahydrofuran; hexane T=-78 - 20°C; 16 h; Inert atmosphere; 3: With hydrogenchloride; water in tetrahydrofuran; hexane; water Inert atmosphere;

hydrogenchloride in tetrahydrofuran; hexane; water T=20°C; 1 h;