in diethyl ether (N2) or (Ar); addn. of Mg(C4H6)*2THF in portions to soln. of (iPr)2NBCl2 at -80°C within 1 h under stirring; stirring at -80°C for 2 h; slowly warming to 20°C; stirring overnight; filtration; washing with Et2O; evapn. of Et2O-soln. and then distn. in vac.; condensation; elem. anal.;

Na#K in hexane byproducts: NaCl, KCl; (under N2) to stirred Cl2BN(i-Pr)2 in hexane 1,3-butadiene is added (-40°C), after stirring for 3 h the cool mixt. is added at 20°C to Na/K-alloy in hexane (10 min, low temp.-condenser) on applying warm air the mixt. starts to reflux (3 h); filtn. under pressure, hexane is distd. off, distn., elem. anal.;

n-butyllithium in hexane n-BuLi in hexane added to soln. of TMEDA in hexane at room temp. under N2, stirred for 30 min, furan added, stirred for 90 min, Cl2BN(C3H7)2 in hexane added to the reaction mixture at -25°C, allowed to warm, and stirred for 20 h at room temp.; volatiles removed in vacuum, residue dissolved in hexane, filtered, solvent evapn. in vacuum, product distilled;

in hexane byproducts: KCl; addn. of a soln. of (i-Pr)2NBCl2 to a suspn. of K2(t(-BuP)4) at -78.degrree.C, warming to 10°C within 12 h; filtn., washing with n-hexane, removal of the solvent, cooling to -20°C, filtn., elem. anal.;

in pentane under N2, borane layered with diimide, stirred for 15 h; removal of volatiles in vac., taken up in pentane, filtered, evapd., cooled to -30°C,; elem. anal.;