in dichloromethane a soln. of MeBBr2 was added dropwise to a soln. of the amine at-78°C with stirring; after formation of the diborylamine, as verified by 11B NMR, the soln. was slowly warmed up to room temp.; all reactions under N2 with exclusion of moisture;; after evapn. of all volatiles at 100 Torr and fractionated distn. (residue is a highly viscous liq.), the borazine crystd. in the recipient; elem. anal.;;
