Developed was a systematic method for the incorporation of the {(eta(6)-arene)Fe} fragment into a carborane cage. Reactions between [(eta(6)-arene)(2)Fe](PF(6))(2) salts and Tl(2)[nido-7,8-C(2)B(9)H(11)] in refluxing (CH(2))(2)Cl(2) generated a series of [3-(eta(6)-arene)-closo-3,1,2-FeC(2)B(9)H(11)] 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 [(eta(6)-arene)(2)Fe](2+) dications fails for mesitylene and durene compounds, which was overcome by a reliable room-temperature modification.
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