Abstract 1 H and 11 B NMR spectroscopy was applied to mono-and bisborane adducts derived from aryl-, benzyl-, phenethyl-and phenylenediamines, but no simple relationship was established between the spectroscopic data and the nature of the N B bond. Comparative studies of the affinity of aromatic amines to BH 3 by equilibria reactions may be of great value in establishing a scale of relative basicity.
