in neat (no solvent) byproducts: diethylamin; under N2; mixed at -78°C; warmed slowly to room temp. with stirring; heated slowly for 2 h up to 100°C; distd. (40 - 70°C, 1E-1 Torr); (Et2N)2BCCSnMe3 and Me3SnCCSnMe3 isolated; elem. anal.;

in tetrahydrofuran; pentane C2H2 introduced in THF, stirred at room temp. for 3 h, C2H5MgBr added to THF soln. of B-compd. at -60°C for 2.8 h, stirred at room temp.for 15 h, THF removed in vac., pentane added to residue, Mg-salt pptd.,soln. concd.; filtered, washed with pentane, distd.; elem. anal.;

sodium in tetrahydrofuran; toluene Na suspended in boiling toluene, cooled, toluene removed, Na washed with THF, THF added, C2H2 introduced in suspn. with stirring, mixt. standing at 45°C for 1 h, cooled to room temp., soln. of Et2NBCl2 in THFadded for 1 h; filtered, solvents removed;

(i) EtMgBr, THF, (ii) /BRN= 969252/, Et2O; Multistep reaction;

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