in 1,4-dioxane; diethyl ether; hexane (N2); dioxane was added to 3 M soln. MeMgBr in hexane and Et2O, stirred for 1 h, filtered, filtrate was added to soln. of zirconium complex in Et2O at -78°C, warmed to room temp. overnight; evapd., dissolved in benzene, filtered, evapd. in vac., crystd. from toluene/hexanes;