Factors relating to the formation of N-alkyl-B-halogenoborazines

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Abstract

The formation of N-alkyl-B-halogenoborazines from alkylammonium halide and boron trihalide (R = Me, Et, Prn, Pri, Bun, Bus, Oct.n but not But), entails the immediate formation of the tetrahalogenoborate, RNH3+BX4, followed by the 1:1 complex, RNH2BX3, ill-defined further intermediates, and then the borazine according to the b.p. of the solvent used. Residues indicated further polymerisation; but were not investigated beyond chemical analysis. The t-butyl system gave the compound, ButNHBCl2; but not the borazine. In the presence triethylamine, the amine systems, except the But one, still gave the borazine, whereas the Bt system afforded the borazocine (ButNBCl)4.

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