in pentane byproducts: (CH3)2NBF2; (N2); without moisture; added BF3 (cooling) to soln. of B-compound in pentane within 60 min; warmed; evapd. at -30°C; condensed at 25°C/10 Torr in -78°C cold vessel;

NH3 in hexane byproducts: (CH3)2NH; (N2); without moisture; added NH3 to soln. of B-compound in hexane within 60 min; evapd. in vac.; distd.; elem. anal.;