methanol; tert.-butyl lithium in diethyl ether; pentane -78°C, molar ratio of stannane=(CH3)3CLi=1:1, the mixt. was allowed to warm to room temp., stirred for 1h, conversion is 50percent (from 1H and 119Sn NMR); recrystn. from diethyl ether;

tert.-butyl lithium in diethyl ether -78°C, molar ratio of starting materials is 1:1, formation of the intermediate is very slow, LiCl elimination is fast, formed stannene reacts with starting (CH3)3CLi, thus the stannene can isolated (same results obtained in THF and THF/Et2O); not isolated;