sodium in diethyl ether; ammonia byproducts: NaCl; react. of (CH3)3ClSn and Na in liquid NH3, addn. of 1,4-dichlorobutane in ether under stirring; evapn., filtration, distn., fractional distn. of residue in vac.; elem. anal.;

in diethyl ether; pentane addn. of soln. of Me3SnCl to soln. of Li-compound (prepd. in situ) at -120°C, warming to room temp.; shaking with water, drying and concn. of org. phase; anal. and GC;