n-butyl lithium in diethyl ether; hexane under Ar, addn. of n-butyl lithium (hexane) to the diene (ether) (-78°C, stirring, 2 h ), warming to room temp., recooling to -78°C, addn. to stilbine, stirring (20 min), warming to room temp.; solv. removed, extraction (pentane), recrystn. (pentane), elem. anal.;

in benzene addn. of Zr-compd. to soln. of Sb-compd., stirred for 10 min; evapd. (vac.), extd. (hexane), cannula-filtered, cooled to -80°C, pptn. filtered, solid discarded, evapd.;