1: With n-butyllithium in tetrahydrofuran; hexane T=-78°C; 2.5 h; 2: With boric acid trimethyl ester in tetrahydrofuran; hexane T=20°C; 8 h; 3: With hydrogenchloride; water in tetrahydrofuran; hexane 1 h;

1: 2: With n-butyllithium; boric acid trimethyl ester

water in methanol T=0 - 20°C; 1 h; Inert atmosphere;

water in methanol T=0 - 20°C; 1 h; Inert atmosphere;