The reaction of LiAlH4 with 1,4-di-tert-butyl-1,4-diazabutadiene: Imine-containing aluminum hydrides stabilized by lithium coordination

Michael G. Gardiner; Stacey M. Lawrence; Colin L. Raston

doi:10.1021/ic990298y

The reaction of LiAlH₄ with 1,4-di-tert-butyl-1,4-diazabutadiene: Imine-containing aluminum hydrides stabilized by lithium coordination

Michael G. Gardiner, Stacey M. Lawrence, Colin L. Raston

Research output: Contribution to journal › Article › peer-review

31 Citations (Scopus)

Abstract

The reaction of 1,4-di-tert-butyl-1,4-diazabutadiene, 1, with purified LiAlH₄ (free from Al metal) in diethyl ether has been investigated in detail, and a range of products have been isolated. The lithium diamidoaluminum dihydride [Li{N(t-Bu)CHCH₂N-t-Bu}₂AlH₂], 2, the dimeric diamidoaluminum hydride [cis-{[μ-N(t-Bu)CH₂CH₂N-t-Bu]-AlH}₂], 3, or the heteroleptic lithium tetraamidoaluminum species [(Et₂O)Li{N(t-Bu)CH₂}₂(CHN-t-Bu) ₂Al], 4, can be selectively obtained depending on the order of addition or stoichiometry of the reactants. We have rationalized these results in terms of the unstable adducts which are likely to be present in solution at low temperature. The X-ray crystal structures of 2 and the dimeric lithium aluminum hydride adduct [{[HN(t-Bu)CH(t-Bu)CHN-t-Bu]-Li(μ-H)₂AlH₂} ₂], 7, are described.

Original language	English
Pages (from-to)	4467-4472
Number of pages	6
Journal	Inorganic Chemistry
Volume	38
Issue number	20
DOIs	https://doi.org/10.1021/ic990298y
Publication status	Published - 1 Dec 1999
Externally published	Yes

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title = "The reaction of LiAlH4 with 1,4-di-tert-butyl-1,4-diazabutadiene: Imine-containing aluminum hydrides stabilized by lithium coordination",

abstract = "The reaction of 1,4-di-tert-butyl-1,4-diazabutadiene, 1, with purified LiAlH4 (free from Al metal) in diethyl ether has been investigated in detail, and a range of products have been isolated. The lithium diamidoaluminum dihydride [Li{N(t-Bu)CHCH2N-t-Bu}2AlH2], 2, the dimeric diamidoaluminum hydride [cis-{[μ-N(t-Bu)CH2CH2N-t-Bu]-AlH}2], 3, or the heteroleptic lithium tetraamidoaluminum species [(Et2O)Li{N(t-Bu)CH2}2(CHN-t-Bu) 2Al], 4, can be selectively obtained depending on the order of addition or stoichiometry of the reactants. We have rationalized these results in terms of the unstable adducts which are likely to be present in solution at low temperature. The X-ray crystal structures of 2 and the dimeric lithium aluminum hydride adduct [{[HN(t-Bu)CH(t-Bu)CHN-t-Bu]-Li(μ-H)2AlH2} 2], 7, are described.",

author = "Gardiner, {Michael G.} and Lawrence, {Stacey M.} and Raston, {Colin L.}",

year = "1999",

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doi = "10.1021/ic990298y",

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T1 - The reaction of LiAlH4 with 1,4-di-tert-butyl-1,4-diazabutadiene

T2 - Imine-containing aluminum hydrides stabilized by lithium coordination

AU - Gardiner, Michael G.

AU - Lawrence, Stacey M.

AU - Raston, Colin L.

PY - 1999/12/1

Y1 - 1999/12/1

N2 - The reaction of 1,4-di-tert-butyl-1,4-diazabutadiene, 1, with purified LiAlH4 (free from Al metal) in diethyl ether has been investigated in detail, and a range of products have been isolated. The lithium diamidoaluminum dihydride [Li{N(t-Bu)CHCH2N-t-Bu}2AlH2], 2, the dimeric diamidoaluminum hydride [cis-{[μ-N(t-Bu)CH2CH2N-t-Bu]-AlH}2], 3, or the heteroleptic lithium tetraamidoaluminum species [(Et2O)Li{N(t-Bu)CH2}2(CHN-t-Bu) 2Al], 4, can be selectively obtained depending on the order of addition or stoichiometry of the reactants. We have rationalized these results in terms of the unstable adducts which are likely to be present in solution at low temperature. The X-ray crystal structures of 2 and the dimeric lithium aluminum hydride adduct [{[HN(t-Bu)CH(t-Bu)CHN-t-Bu]-Li(μ-H)2AlH2} 2], 7, are described.

AB - The reaction of 1,4-di-tert-butyl-1,4-diazabutadiene, 1, with purified LiAlH4 (free from Al metal) in diethyl ether has been investigated in detail, and a range of products have been isolated. The lithium diamidoaluminum dihydride [Li{N(t-Bu)CHCH2N-t-Bu}2AlH2], 2, the dimeric diamidoaluminum hydride [cis-{[μ-N(t-Bu)CH2CH2N-t-Bu]-AlH}2], 3, or the heteroleptic lithium tetraamidoaluminum species [(Et2O)Li{N(t-Bu)CH2}2(CHN-t-Bu) 2Al], 4, can be selectively obtained depending on the order of addition or stoichiometry of the reactants. We have rationalized these results in terms of the unstable adducts which are likely to be present in solution at low temperature. The X-ray crystal structures of 2 and the dimeric lithium aluminum hydride adduct [{[HN(t-Bu)CH(t-Bu)CHN-t-Bu]-Li(μ-H)2AlH2} 2], 7, are described.

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JO - Inorganic Chemistry

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The reaction of LiAlH₄ with 1,4-di-tert-butyl-1,4-diazabutadiene: Imine-containing aluminum hydrides stabilized by lithium coordination

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