n-butyllithium in tetrahydrofuran; benzene equimolar amt. of BuLi added to a soln. of furan in THF at 0°C; soln. immediately turned yellow; resulting mixt. stirred for 30 min at 0°C; soln. of GeCl4 in C6H6 added at 0°C and mixt. stirred for another 3 h at 25°C; mixt. poured into H2O and extd. with EtOAc; combined org. layer dried and concd. in vacuo; recrystn. from toluene;

in tetrahydrofuran; hexane; benzene under Ar; n-BuLi/hexane added to soln. of furan in THF at 0°C, mixt. stirred at 0°C for 30 min, soln. of GeCl4 in benzene slowly added at 0°C, mixt. stirred at 25°C for 3 h; mixt. poured into water, extn. with EtOAc, combined org. phases dried, concd. under vac., column chromy. (silica gel); elem. anal.;

ethyl bromide; diethyl ether; lithium Erwaermen der erhaltenen <2>Furyllithium-Loesung mit Germanium(IV)-bromid in Benzol;

lithium in tetrahydrofuran 4-fold excess of Li metal added to a soln. of Ge comp. in THF; mixt. stirred for 1.5 h at 25°C; extn. with EtOAc; purified by silica-gel column chromy.; elem. anal.;