Efficient synthesis and NMR data of N- or B-substituted borazines

The thermolysis of borane-primary amine complexes RNH2. BH3 was reexamined. Excellent yields of N-substituted borazines were obtained at 200 degrees C , when R is an alkyl group, and at 120 degrees C for R = Ph, B-alkyl, vinyl , and alkynyl borazines were easily prepared in good to excellent yields by ammonolysis of bis(diisopropylamino)organoboranes at temperatures above 95 degrees C. The H-1, C-13, and N-15 or N-14 NMR data for all borazines prep ared are reported for the fires time. (C) 2000 John Wiley & Sons, Inc.