n-butyllithium in tetrahydrofuran; hexane; toluene N2-atmosphere; dropwise addn. of BuLi (in hexane) to indene derivative (in THF) at -78°C, warming to room temp., stirring for 30 min, dropwise addn. to Zr-complex (in PhMe) over 2 h at 0°C, stirring (room temp., 2 h, pptn.); filtration, washing (THF/PhMe=1:2), drying (vac., overnight); elem. anal.;

n-BuLi in tetrahydrofuran; toluene (Ar); Standard Schlenk technique; n-BuLi added to soln. of ligand in THFat -78°C; warmed to room temp.; stirred for 4 h; solvent removed (vac.); toluene added; ZrCl4/toluene added dropwise at -78°C; wa rmed to room. temp.; stirred for 18 h; filtered through Celite pad; pad washed (toluene); vol. of filtrate reduced in vac.; crystd. at -18°C; elem. anal.;