“…1, inset) is an extremely Lewis acidic compound that binds CO 41 and activates dihydrogen towards H-H bond cleavage. 42,43 In the latter reaction, an adduct of H2 with V is clearly implicated. Borole V also undergoes less well defined reactions with silanes that involve cleavage of the Si-H bond, 44 but due to the compound's low solubility in non-donor solvents, we have been unable to conduct low temperature spectroscopic studies aimed at detecting either an H2 or a silane adduct of V. Accordingly, we recently reported the synthesis of 1,2,3-tris(pentafluorophenyl)-4,5,6,7-tetrafluoro-1-boraindene, 45 1 ( Fig.…”