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;