in hexane byproducts: LiCl; inert atmosphere; slow addn. of 2 equiv. Me2GeCl2 to dilithiothiophene, stirring at room temp. for 24 h; filtration off of LiCl, pptn. on concn. (vac.); elem. anal.;

n-butyllithium; N,N,N',N,-tetramethylethylenediamine in hexane N2-atmosphere; stirring and refluxing thiophene with BuLi and TMEDA for 2 h, add. of excess Me2GeCl2, stirring at room temp. for 3 h; collection (filtration), washing (water, MeOH, hexane), drying (vac.); elem. anal.;