triethylsilane; titanium tetrachloride in tetrahydrofuran; dichloromethane T=-60 - 20°C; 1 h;

n-butyllithium; N,N,N',N,-tetramethylethylenediamine in tetrahydrofuran; hexane T=-78°C; 0.5 h; Inert atmosphere;

1: 100 percent / tetrahydrofuran / 48 h / 0 - 20 °C 2: 66 percent / TiCl4; triethylsilane / CH2Cl2; tetrahydrofuran / 1 h / -60 - 20 °C View Scheme