sodium in diethyl ether; ammonia byproducts: NaCl; sodium was added at stirring to suspn. of tin compd. in ether-liq.NH3 at -50°C, prepd. soln. was added dropwise to ether soln. of Me3SnCl, NH3 evapd., NaCl sepg.; concg., distn.; elem. anal.;

lithium in tetrahydrofuran byproducts: LiCl; soln. of tin compd. was added to Li in THF, stirring at room temp for 3-4 h anf at 50°C for 1 h, filtration, addition of filtrate to THF soln. of Me3SnCl at 0°C, stirring at room temp., THF evpn., adding of ether, washing with H2O; extg. of water phase with Et2O, concg. distn. in vac.; elem. anal.;