trimethylstannyl chloride in tetrahydrofuran; diethyl ether inert atmosphere; addn. of Me3SnCl to Li-salt in Et2O at -40°C, warming to room temp., evapn., addn. of ZrCl4 suspn. in THF, stirring (80°C, 4 h); evapn. (80-90°C, 1 torr), recrystn. or washing;

methylaluminoxane in benzene-d6 under Ar, standard Schlenk techniques; solid dichloride Zr complex mixedwith 1 equiv. of Cp2ZrClMe; dissolved in benzene-d6; a minute amt. of s olid methylaluminoxane added; equil. reached within several min; not isolated; monitored by (1)H NMR spectra;

methylaluminoxane in benzene-d6 under Ar, standard Schlenk techniques; solid dichloride Zr complex mixedwith 1 equiv. of (indenyl)2ZrClMe; dissolved in benzene-d6; a minute am t. of solid methylaluminoxane added; equil. reached within several min; not isolated; monitored by (1)H NMR spectra;

in diethyl ether meso-Me2Si(1-indenyl)2ZrCl2 suspended in Et2O, cooled at -78°C, 2equiv. of CH3Li in Et2O added, after 30 min mixt. slowly warmed to room temp., stirred for 4 h; solvent removed under reduced pressure, residue extracted with anhydroustoluene, concd., cooled to -20°C; elem. anal.;