Systematic Method for the Incorporation of the {(η⁶-Arene)Fe} Fragment into Carborane Cages via [(η⁶-Arene)Fe]²⁺ Dications. A Series of [3-(η⁶-Arene)-<i>closo</i>-3,1,2-FeC₂B₉H₁₁] Complexes. Reliable Synthesis of Polymethy

Developed was a systematic method for the incorporation of the {(η6-arene)Fe} fragment into a carborane cage. Reactions between [(η6-arene)2Fe](PF6)2 salts and Tl2[nido-7,8-C2B9H11] in refluxing (CH2)2Cl2 generated a series of [3-(η6-arene)-closo-3,1,2-FeC2B9H11] neutral complexes with variable types of polymethylated arene ligands in the structure. The structures of durene and hexamethylbenzene complexes were established by X-ray diffraction analyses. The work also shows that the original high-temperature method for the preparation of the [(η6-arene)2Fe]2+ dications fails for mesitylene and durene compounds, which was overcome by a reliable room-temperature modification.