N‐Heterocyclic Carbene Complexes of Cp–Aluminum Triflate

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...

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Bibliographic Details
Published in:European journal of inorganic chemistry 2018-06, Vol.2018 (20-21), p.2232-2236
Main Authors: Wang, Chen‐Hao, Lin, Ya‐Fan, Tseng, Hsi‐Ching, Lee, Gene‐Shiang, Peng, Shie‐Ming, Chiu, Ching‐Wen
Format: Article
Language:English
Subjects:
Acetonitrile
Aluminum
Carbene ligands
Carbon dioxide
Chloroform
Coordination compounds
Cyclopentadienyl ligands
Inorganic chemistry
Ligands
Nitromethane
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Summary: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. Two aluminum half‐metallocene complexes featuring strong σ‐donating NHC ligands and weakly coordinating triflate were prepared and characterized. The neutral Al complexes are found to be more acidic than B(C6F5)3 on the Gutmann–Beckett scale and react with nitromethane and CO2 through insertion of N=O/C=O to the Cp*–Al bond.
ISSN:1434-1948
1099-0682
DOI:10.1002/ejic.201800205