What the study found
The study reports a terminal thorium imido metallocene, (η5-C5Me5)2Th(═Ndipp)(dmap), and describes its broad reactivity with small molecules. The complex can activate or react with a range of compounds, including sulfur, alkynes, carbodiimides, aldehydes, carbon disulfide, nitriles, isonitriles, and azides.
Why the authors say this matters
The authors conclude that comparing this compound with related terminal imido thorium metallocene derivatives shows how changes in cyclopentadienyl and imido substituents influence reactivity. The study suggests this comparison helps clarify how ligand choice affects the behavior of these thorium compounds.
What the researchers tested
The researchers prepared the thorium dimethyl metallocene (η5-C5Me5)2ThMe2 with dippNH2 in toluene in the presence of 4-dimethylaminopyridine to form the terminal thorium imido metallocene, with methane released. They then tested its reactions with many small molecules, including S8, alkynes, carbodiimides, aldehydes, CS2, nitriles, isonitriles, organic azides, Me3PO, thiazole, 2-MepyNO, amines, hydrazine derivatives, terminal alkynes, ketones, amidates, imines, hydrosilanes, and reagents such as Me3SiX, Ph3CN3, CuBr, and AgI.
What worked and what didn't
Complex 4 was reported to activate S8, alkynes, carbodiimides, aldehydes, CS2, organic nitriles and isonitriles, and organic azides, giving metallaheterocycle, pyridyl amido, oxido, and bis-amido complexes, respectively. It also formed an adduct with Me3PO, could promote deprotonation in several reactions, behaved as a nucleophile toward PhSiH2Cl, underwent Friedel–Crafts type reactions with Me3SiX and Ph3CN3, and gave distinct products with CuBr and AgI.
What to keep in mind
The abstract does not provide quantitative yields, reaction conditions for each transformation, or detailed mechanistic analysis. The summary is limited to the reactions and comparisons stated in the abstract.
Key points
- A terminal thorium imido metallocene, (η5-C5Me5)2Th(═Ndipp)(dmap), was prepared from a thorium dimethyl precursor.
- The complex reacted with a wide range of small molecules, including sulfur, carbon disulfide, nitriles, and azides.
- Different reactions produced metallaheterocycle, pyridyl amido, oxido, and bis-amido complexes.
- The imido moiety also promoted deprotonation reactions and acted as a nucleophile toward PhSiH2Cl.
- Comparisons with related compounds showed that cyclopentadienyl and imido substituents affect reactivity.
Disclosure
- Research title:
- Thorium imido complex shows broad small-molecule reactivity
- Authors:
- Yi Heng, Xiaoying Cao, Wanjian Ding, Guohua Hou, Guofu Zi, Marc D. Walter
- Institutions:
- Beijing Normal University, Beijing Normal University, Beijing Normal University, Beijing Normal University, Beijing Normal University, Technische Universität Braunschweig
- Publication date:
- 2026-06-28
- OpenAlex record:
- View
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