CH3Li in tetrahydrofuran; diethyl ether byproducts: LiCl; Ar atmosphere, addn. of Et2O soln. of CH3Li to THF/Et2O soln. of silyl compound at 0°C, stirring (room temp., 8 h), reflux (6 h), addn. of ZnCl2 at room temp., stirring (8 h); removement of volatiles (vacuum), dissolution (Et2O), filtration, dryingand concn. of filtrate, sublimation (110°C, vacuum); elem. anal.;

in diethyl ether; hexane Ar atmosphere, reflux;