Abstract
The first examples of linear, butterfly, and cubic Cr/Se complexes containing functionally substituted Cp ligands have been successfully synthesized by skeleton and functional transformations of the prefunctionalized Cp metal precursors. For example, (i) the prefunctionalized Cp metal precursors [η5-RC5H4Cr(CO)3]2 (1, R = MeCO; 2, R = MeO2C) reacted with elemental selenium under the given conditions to afford linear complexes [η5-RC5H4Cr(CO)2]2Se (3, R = MeCO; 4, R = MeO2C), butterfly complexes [η5-RC5H4Cr(CO)2]2Se2 (5, R = MeCO; 6, R = MeO2C), and cubane clusters (η5-RC5H4)4Cr4Se4 (7, R = MeCO; 8, R = MeO2C), whereas the linear complexes 3/4 reacted with elemental selenium under appropriate conditions to produce butterfly complexes 5/6 or cubane clusters 7/8; (ii) thermolysis of a THF solution of butterfly complex 5 or 6 gave rise to cubane cluster 7 or 8, whereas the THF solution of two butterfly complexes [CpCr(CO)2]2Se2 and 6 under reflux afforded cubane clusters (η5-MeO2CC5H4)nCp4-nCr4Se4 (n = 0, Cp4...
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