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Issue 15, 2014
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Reactivity and catalytic activity of tert-butoxy-aluminium hydride reagents

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Abstract

The reactivity and catalytic activities of the tert-butoxy aluminium hydride reagents [(tBuO)xAlH3−x] [x = 1 (1), 2 (2)] and (L)Li[(tBuO)2AlH2] [L = THF (3), 1,4-dioxane (4)] are investigated. The structural characterisation of the novel compounds 3 and 4 shows that the nature of the hydridic species present is affected dramatically by the donor ligand coordinating the Li+ cation. Stoichiometric reaction of 1 with pyridine gives [(1,4-H-pyrid-1-yl)4Al][(pyridine)4AlH2]+ (5) while reaction with the amine–borane Me2NHBH3 in the presence of PMDETA [(Me2NCH2CH2)2NMe] affords [(PMDETA)AlH2]+[(BH3)2NMe2] (6). The reagents 1–4 catalyse the dehydrocoupling reaction of the amine–borane Me2NHBH3 into the ring compound [Me2NBH2]2, with the activity decreasing in the order 123 > 4. The greater reactivity of the neutral dihydride 1 provides the potential basis for future catalytic optimisation.

Graphical abstract: Reactivity and catalytic activity of tert-butoxy-aluminium hydride reagents

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Publication details

The article was received on 15 Jan 2014, accepted on 12 Feb 2014 and first published on 13 Feb 2014


Article type: Paper
DOI: 10.1039/C4DT00152D
Author version available: Download Author version (PDF)
Citation: Dalton Trans., 2014,43, 5785-5792
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    Reactivity and catalytic activity of tert-butoxy-aluminium hydride reagents

    R. J. Less, H. R. Simmonds and D. S. Wright, Dalton Trans., 2014, 43, 5785
    DOI: 10.1039/C4DT00152D

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