“…The antipodal effect for nido and closo boron cage compounds has been well documented. 12 In general, it is observed, for a given periodic table group (e.g., P, As, Sb, Bi) of helero boranes, that the more electronegative the heteroatom, the more shielded is the antipodal boron atom of the icosahedral structure. The "B chemical shift values for the antipodal boron atoms of the As-BuHn", SbBnHif, and ,, ^ions are +7.9, +9.4, and +12.3 ppm, respectively, in accord with this generality.…”