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Published on: March 19, 2020
Diverse Reactivity of a Pincer-Type Dialuminum Complex
Ren Zhou1, Yuqi Jiang1, Ruihao Huang1
1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
None:
Although the main group complexes supported by trianionic pincer-type ligands have attracted significant attention, the chemistry of aluminum remains underdeveloped. Herein, we report the diverse reactivity of a trimethyl dialuminum(III) complex (1) supported by a trianionic [NNN]3- pincer ligand. Treatment of 1 with tetrahydrofuran and protic substrates (2,6-diisopropylphenol, 2,6-diisopropylaniline, and borane ammonia complex) leads to a series of cyclic dialuminum species (2-5), characterized by nuclear magnetic resonance (NMR) spectroscopy and X-ray crystallography. Key transformations include solvent-induced structural rearrangement (2) and protonolysis of bridging Al-CH3 bonds (3-5). Additionally, iodination of the terminal methyl groups in 3 and 4 results in the formation of asymmetric 6 and symmetric 7, respectively. Further reactions of iodinated derivative 6 with N-heterocyclic carbene (NHC) and acetonitrile generate spirocyclic (8) and insertion (9) products.
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