ANALYTICAL PYROLYSIS OF ALKYLAMMONIUM TETRAPHENYLBORATES

Various alkylammonium, dialkylammonium, trialkylammonium and tetraalky lammonium tetraphenylborates were prepared. The thermal decomposition curves of RNH3BPh4, R2NH2BPh4, R3NHBPh4 and R4NBPh4 (where R = Me, Et, n-Bu) in nitrogen atmosphere indicate that the elimination of volatil e matter leads to the formation of both 1:1 complex of trialkylamino t riphenylborane and dialkylamino diphenylborene. Further elimination of volatile matter leads to the formation of borazine at 600-680-degrees -C. When borazine is further heated at 980-1090-degrees-C an exothermi c change indicates the polycyclic condensation of the borazine leading to the formation of boron nitride. The volatile matter evolved in the se reactions was measured quantitatively and reaction mechanisms were suggested.