in tetrahydrofuran byproducts: LiCl; N2-atmosphere; slow addn. of excess of Li-salt to TiCl4 at -78°C,stirring (room temp., overnight); evapn. (reduced pressure), extn. into MePh, filtration off of LiCl, concn., crystn. (-20°C, overnight), filtration, washing (MePh, 0°C), drying (vac.); elem. anal.;

n-butyllithium; chloro-trimethyl-silane; ammonium chloride in tetrahydrofuran; dichloromethane; Petroleum ether Ar; nBuLi, diene, petroleum ether, -10°C; stirring, room temp.; ppt. dissolved in THF; Me3SiCl in THF added; stirring, room temp., 6 h; aq. NH4Cl added, 0°C; extd. with Et2O; evapn.; dissolved in CH2Cl2; TiCl4/CH2Cl2 added, stirring; solvent removed under vac., residue washed with petroleum ether, dried; elem. anal.;