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Issue 11, 2014
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Synthesis, characterization and reactivity of an imidazolin-2-iminato aluminium dihydride

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Abstract

The reaction of bis(2,6-diisopropylphenyl)imidazolin-2-imine (LH, 1) with Me3N·AlH3 furnishes {μ-LAlH2}2 (2). The marked tendency of 2 to release its hydride substituents is ascribed to the strong electron-donor character of the imidazolin-2-iminato ligand. This is supported by its reactivity study and DFT calculations. In fact, compound 2 was further converted with Me3SiOTf, Me2S·BH3, Me2S·BBr3, and BX3 (with X = Cl, Br, and I) into {μ-LAl(H)OTf}2 (3), {μ-LAl(BH4)2}2 (4), and {μ-LAlX2}2 (5, X = Br; 6, X = Cl; 7, X = I), respectively. For all new aluminium complexes the formulation as dimers was evidenced by high resolution mass spectrometry, as well as single-crystal X-ray diffraction analysis. A prominent structural motif of these compounds is the square-planar four-membered Al2N2 ring with two bridging bulky imidazolin-2-imino moieties.

Graphical abstract: Synthesis, characterization and reactivity of an imidazolin-2-iminato aluminium dihydride

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Supplementary files

Article information


Submitted
23 Sep 2013
Accepted
26 Nov 2013
First published
27 Nov 2013

Dalton Trans., 2014,43, 4451-4461
Article type
Paper

Synthesis, characterization and reactivity of an imidazolin-2-iminato aluminium dihydride

D. Franz, E. Irran and S. Inoue, Dalton Trans., 2014, 43, 4451
DOI: 10.1039/C3DT52637B

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