1: With n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran; hexane T=20°C; 2 h; Inert atmosphere; 2: With 1,2-di-iodoethane in tetrahydrofuran; hexane T=20°C; 2 h; Inert atmosphere; 3: With hydrogenchloride in tetrahydrofuran; hexane; water Inert atmosphere;