Preparation and Characterization of Some Polyborazines

Studies on 1-Trimethylsilyl-2,4,6-Triethylborazine and Related Species.

“…The interaction of BX 3 (X = Cl, Br) with 2,4,6-triorganylborazines, (-BR-NR'-), has recently been found to proceed with successive displacement of the B-bonded organic substituents and the exclusive formation of RBX 2 and B-halogenated borazines. The process has been used for the preparation of various B-monohaloand B,B'-dihaloborazines as is illustrated in equations 6 and 7 (X = Cl, Br) [4,6].…”

“…-The 10-eV mass spectrum exhibited no parent ion, but the base peak was that of [M minus CH 3 ] with m/z = 368 (6), 367 (30), 366 (100), 365 (72), 364 (18) (calcd m/z = 368 (7), 367 (27), 366 (100), 365 (65), 364 (14)). 4,6triethylborazine,(C 2…”

“…56-57*C(2 Torr) 131, and 25 g of (C 2 H 5 ) 3 B 3 N 3 H 2 [Si(CH 3 ) 3 1, b.p. 65-68'C(2 Torr) [4]. As is based on NMR and mass spectroscopic data, a higher boiling residue (b.p.…”

“…Yields of this latter borazine were found to be irregular and ranged between 10 and 40 %. Variations of the experimental conditions did not establish a clear trend, although relatively large-scale syntheses (I molar scale and above) and working at about 0°C (rather than at lower temperatures) tended to give somewhat higher yields of the unsymmetrical species (4].…”

“…However, in a study of the reaction between BC1 3 and various silylamines it has been found that, besides the "normal" Si-N bond cleavage with the elimination of (CH 3 [4]. Yields of this latter borazine were found to be irregular and ranged between 10 and 40 %.…”