n-butyllithium in diethyl ether; hexane treatment of BuLi in hexane with teluride in THF (-78°C), addn. of Me3SiCl, warming to room temp. (mixing, over period of 1 h); not isolated; NMR spectroscopy;

iodine; ammonium chloride in diethyl ether N2-atmosphere; addn. of Me3SiCH2Cl to Mg (activated with I2), refluxing(1 h), addn. of Bu3SnCl, refluxing (18 h); addn. of satd. aq. NH4Cl, extn. of aq. layer (ether), washing of org. layer (satd. aq. NaCl), drying (Na2SO4), evapn. of ether, distn. (vac.);

in benzene-d6 (N2); to soln. of scandium complex in C6D6 was added nBu3SnCl, allowed for 17 h; detected by NMR;

n-butyllithium in tetrahydrofuran; hexane soln. of Si-compd. in dry THF cooled to 0°C then n-BuLi in hexane added to this soln. under N2, after 30 min reaction mixt. cooled to -78°C, and added to Ph3SnCl in dry THF, warmed to ambient temp., stirred for 2 h, quenched with aq.NH4Cl; extd. with ether, washed with satd. aq. NaCl soln., dried (Na2SO4), concd. in vac., triturated with hexane for removing of Ph4Sn, hexane soluble material chromd. (silicagel, hexane/CH2Cl2), elem. anal.;

n-butyllithium in tetrahydrofuran; hexane soln. of Si-compd. in dry THF cooled to 0°C then n-BuLi in hexane added to this soln. under N2, after 30 min reaction mixt. cooled to -78°C, soln. of Ph3SnCl in THF added, warmed to ambient temp., stirred for 2 h, quenched with aq. NH4Cl; extd. with chlorofom, washed with satd. aq. NaCl soln., dried (Na2SO4),concd. in vac., recrystd. of residue gave Ph4Sn, hexane soluble material chromd. (silicagel, hexane/CH2Cl2), elem. anal.;

n-butyllithium in tetrahydrofuran; hexane soln. of Si-compd. in dry THF cooled to 0°C then n-BuLi in hexane added to this soln. under N2, after 30 min reaction mixt. cooled to -78°C, soln. of Ph3SnCl in THF added, warmed to ambient temp., stirred for 2 h, quenched with aq. NH4Cl; extd. with chlorofom, washed with satd. aq. NaCl soln., dried (Na2SO4),concd. in vac., recrystd. of residue gave Ph4Sn, hexane soluble material chromd. (silicagel, hexane/CH2Cl2), elem. anal.;

n-butyllithium Yield given. Multistep reaction;

n-butyllithium Direct methylenation of ketones; Product distribution;

n-butyllithium Yield given. Multistep reaction;

n-butyllithium Direct methylenation of aldehydes.; Product distribution;