lithium diisopropyl amide in diethyl ether; hexane soln. of acetate is dropwise added to LDA (prepd. from n-Buli (hexane) and diisopropylamine) in ether at -78°C (N2), stirring for 1 h, chlorotrimethylgermane is added in ether, addnl. stirring at -78°C for 3.5 h; aq. NH4Cl is added, aq. layer extd. (benzene), washed (H2O, aq. NaCl), dried (MgSO4), concd., distn.; elem. anal.;

tetrabutyl ammonium fluoride in tetrahydrofuran soln. of TBAF is added to soln. of ethyl (trimethylgermyl)(trimethylsilyl)acetate and trimethylacetaldehyde in THF at -78°C (N2), stirring for 1 h; addn. of ether, washing (aq.NaCl), drying (MgSO4), concn., chromy. (silica gel, hexane/ether);

tetrabutyl ammonium fluoride in tetrahydrofuran to soln. of benzaldehyde and TBAF is added dropwise a soln of ethyl (trimethylgermyl)(trimethylsilyl)acetate in THF at 0°C (N2), stirring for 1 h; mixt. is mixed with ether, washed (aq. NaCl), dried (MgSO4), concd., distd.;