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Formally Zerovalent Bis(arene) Germylene Complexes of Zirconium and Hafnium
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2024-11-19 , DOI: 10.1002/anie.202420114
Max J. Eberhardt, Mira Baum, Stefan F. Clewing, Hartmut Schubert, Lars Wesemann

Tetrachlorides of zirconium‐ and hafnium form adducts (2, 3) with an intramolecular germylene phosphine Lewis pair. Two electron reduction treating the adducts with [MesNacnacMg]2 gives the low valent metal complexes (4, 5) featuring η6‐Trip coordination at the Zr(II) and Hf(II) metal atom. Reduction of the M(II)‐complexes gives the zerovalent metal complexes of zirconium (6) and hafnium (7), which have been structurally characterized. Two arene moieties and the germylene exhibit metal coordination. Puckered coordination of a P‐phenyl unit was observed for both derivatives 6 and 7. Four electron reduction of a reaction mixture of metal tetrachloride with the germylene‐phosphine Lewis pair also gives the zerovalent complexes in good yield. Carbonyl complexes were synthesized treating the reduced metal complexes with carbon monoxide. Dimethylbutadiene shows a reaction with an arene moiety and the coordinated germylene ligand of the zerovalent complexes. A cyclohexadienyl and a triorganogermate ligand are formed. For zirconium this reaction is reversible at room temperature.

中文翻译:


正式的锆和铪的零价双(芳烃)Germylene 配合物



锆和铪的四氯化物与分子内 germylene 膦 Lewis 对形成加合物 (2, 3)。用 [MesNacMg]2 处理加合物的双电子还原得到低价金属络合物 (4, 5),在 Zr(II) 和 Hf(II) 金属原子处具有 η6-Trip 配位。M(II) 配合物的还原得到锆 (6) 和铪 (7) 的零价金属配合物,它们已被结构表征。两个芳烃部分和 germylene 表现出金属配位。对于衍生物 6 和 7,观察到 P-苯基单元的褶皱配位。四氯化金属与germylene-phosphine Lewis对的反应混合物的四电子还原也以良好的产率得到零价配合物。合成羰基配合物,用一氧化碳处理还原金属配合物。二甲基丁二烯与芳烃部分和零价配合物的配位 germylene 配体发生反应。形成环己二烯基和三有机乳聚体配体。对于锆,该反应在室温下是可逆的。
更新日期:2024-11-19
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