Synthesis of 16-Electron (η<sup>3</sup>-Cyclooctenyl)metallacarboranes of Rhodium(III) and Iridium(III) with the New Sterically Demanding [(4‘-MeC<sub>6</sub>H<sub>4</sub>)<sub>2</sub>C<sub>2</sub>B<sub>9</sub>H<sub>9</sub>]<sup>2-</sup> Carborane Ligand. Molecular Structures of [3-{(1−3-η<sup>3</s
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Reactions of the [K]+ salt of the [7,8-(4‘-MeC6H4)2-7,8-nido-C2B9H10]- monoanion with the COD−rhodium and COD−iridium μ-chloride complexes [(η4-COD)2M2(μ-Cl)2] proceed in benzene at ambient temperature with the formation of the 16-electron complexes [3-{(1−3-η3)-C8H13}-1,2-(4‘-MeC6H4)2-3,1,2-pseudocloso-MC2B9H9] (5, M = Rh(III); 6, M = Ir(III)), respectively, whose pseudocloso strucrure has been confirmed by single-crystal X-ray diffraction studies. The major species 5 is formed along with a small amount of the dimeric rhodacarborane [(η6-MeC6H4)Rh(C2B9H9C6H4Me)Rh(η4-C8H12)]2 (7), which, as found from X-ray structure determinations, is composed of two distorted {4,9,1,10-Rh2C2B9} cluster units joined together through η6 coordination of the 4-tolyl cage substituent of one unit to one of the rhodium atoms of the second unit and vice versa.
