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• W2040696074 abstract "The reaction of primary and secondary amines with the hexameric tert-butylalumoxane, [(tBu)Al(μ3-O)]6, has been investigated. Reaction of [(tBu)Al(μ3-O)]6 with 2 equiv of RNH2 (R = Et, nPr, iPr, nBu, tBu) results in the formation of [(tBu)6Al6(μ3-O)4(μ-O)2(NH2R)2], R = Et (1), nPr (2), iPr (3), nBu (4) and tBu (5). The molecular structure of compound 4 has been determined by X-ray crystallography, the Al6O6 core structure of which consists of two fused boat-conformation Al3O3 rings, derived from the opening of two opposing edges of the Al6O6 cage of [(tBu)Al(μ3-O)]6. The nBuNH2 groups are bound to the aluminum atoms of the open cage. Compounds 1−3 and 5 are isostructural to compound 4 on the basis of 1H and 13C NMR spectroscopy. No reaction is observed for R2NH (R = Et, iPr, nBu, Ph). On the basis of the cone angle (θ) of the amine, we suggest that steric hindrance is the reason for the lack of reactivity of the secondary amines R2NH. A discussion of the steric constraints imposed on a latent Lewis acid is presented." @default.
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• W2040696074 date "1996-12-24" @default.
• W2040696074 modified "2023-09-23" @default.
• W2040696074 title "Reaction of Amines with [(^tBu)Al(μ₃-O)]₆: Determination of the Steric Limitation of a Latent Lewis Acid" @default.
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• W2040696074 doi "https://doi.org/10.1021/om960677o" @default.
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