Abstract: | Tetraethylammonium 7‐dimethylsulfanyl‐nido‐dodecahydroundecaborate, Et4N]7‐Me2S‐nido‐B11H12] or C8H20N+·C2H18B11S?, is a product of the deprotonation of 7‐Me2S‐nido‐B11H13] with KHBEt3 and precipitation with tetraethylammonium chloride. The effect of removing one endo‐terminal H atom is to cause a general contraction of the open‐face B—B distances. |