LiPPh2 in toluene anhydrous and oxygen-free condns., addn. of Li-compd. in toluene to a soln. of B-compd. in toluene at -60°C, stirred for 2 d at ambient temp.; filtered, evapn. of solvent in vac., dissolved in pentane, cooled to -78°C for 14 d; elem. anal.;

LiNHCMe3 in hexane anhydrous and oxygen-free condns., addn. of Li-compd. in hexane to a soln. of B-compd. in hexane at -60°C within 10 min, allowed to reach ambient temp., stirred for 5 h; centrifuged, evapn. of solvent in vac., recrystn. (pentane/toluene (10:1), -78°C); elem. anal.;

Li-t-Bu in hexane anhydrous and oxygen-free condns., addn. of t-BuLi in hexane to a stirred soln. of B-compd. in petroleum ether at -78°C, warmed to ambient temp., stirred at ambient temp. for 7 d; filtered, reduced in volume, cooled to -78°C;