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Diborane and methyl cyanide at 80–90° give as volatile products NN′N″-triethylborazine Et3N3B3H3(35–40% yield), µ-diethylaminodiborane Et2NB2H5(ca. 1% yield), and materials of higher molecular weight (15–20% yield) which may include compounds of formulae Et5N5B4H2, Et4N5B5H4, and Et5N6B6H5. Aspects of the i.r. and 1H and 11B n.m.r. and mass spectra of the products are discussed, and possible structures for the materials of higher molecular weight are indicated. Spectroscopic details are also given for µ-ethylaminodiborane EtNHB2H5, prepared from EtNH2 and B2H6.
Jennings et al. (Mon,) studied this question.