To prepare the half‐metallocene complex of aluminum strong σ‐donating NHC ligands were allowed to react with [Cp*Al(OTf)₂]₂ to afford the corresponding Cp*Al(NHC)(OTf)₂ compound (3). The neutral Al complexes turned out to be more acidic than B(C₆F₅)₃ on the Gutmann–Beckett scale and highly reactive towards chloroform, acetonitrile and nitromethane. With the unsaturated IMes ligand, the nitromethane insertion complex occurred via carboalumination of Cp*–Al across the N=O bond was obtained and structurally characterized. Similar addition product could also be observed in the reaction of Cp*Al(IMes)(OTf)₂ with CO₂.

中文翻译：

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Cp *-三氟甲磺酸铝的N-杂环碳化合物

为了制备铝的半茂金属络合物，使强σ供体的NHC配体与[Cp * Al（OTf）₂ ] _2反应，得到相应的Cp * Al（NHC）（OTf）₂化合物（3）。结果表明，中性的Al络合物在Gutmann–Beckett规模上比B（C ₆ F ₅）₃更具酸性，并且对氯仿，乙腈和硝基甲烷具有高反应活性。使用不饱和IMes配体，通过Cp * -Al跨N = O键的碳铝化反应生成了硝基甲烷插入配合物，并进行了结构表征。在Cp * Al（IMes）（OTf）₂与CO ₂的反应中也可以观察到类似的加成产物。