LDA in tetrahydrofuran (inert atmosphere); addn. of LDA in THF at -78°C to the Ge compd.in THF, stirring 5 h while warming up to -30°C, addn. of Me3GeCl in THF, warming to room temp., quenching with satd. aq. NH4Cl; phase sepn., washing (H2O), drying (CaCl2), concn., gas chromy.;

LDA in tetrahydrofuran; hexane (inert atmosphere); addn. of LDA in THF/hexane at -78°C to the cyclopropene in THF, stirring (-30°C, 1 h), addn. of Me3GeCl, stirring (room temp., 15 h), quenching with satd. aq. NH4Cl; filtration, phase sepn., washing (H2O), drying (MgSO4), concn. (rotavapor), gas chromy.;

1: LDA / tetrahydrofuran 2: LDA / tetrahydrofuran View Scheme