Abstract
Since the isolation of the first stable molecular aluminum(II) compound {(Me3Si)2CH}2Al–Al{CH(SiMe3)2}2, the field of low oxidation state aluminum species has burgeoned tremendously. Organoaluminum(I) species (RAl) n stabilized with bulky substituents have been isolated and used as reducing agents, precursors to aluminum(III) compounds, ligands toward transition group metal complexes, and main group Lewis acids. Mixed valent aluminum compounds and numerous clusters such as the large aluminum anion [Al77{N(SiMe3)2}20]2− have provided insight into the stepwise formation of metallic aluminum from molecular precursors. It now appears likely that low oxidation state organoaluminum compounds will find their way into the organic and organometallic synthetic toolbox.
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Abbreviations
- 2e–2c:
-
Two electrons–two centers
- Ar′:
-
2,6-Mes2C6H3
- Bbp:
-
2,6-{(Me3Si)2CH}2C6H3
- Cp:
-
Cyclopentadienide
- Cp*:
-
Pentamethylcyclopentadienide
- Cp′:
-
Tetramethylcyclopentadienide
- Dipp:
-
2,6-(i-Pr)2C6H3
- Dipp*:
-
2,6-(2,6-(i-Pr)2C6H3)2C6H3
- Do:
-
Donor
- EPR:
-
Electron paramagnetic resonance
- HOMO:
-
Highest occupied molecular orbital
- IDipp:
-
1,3-Di-(2,6-(i-Pr)2C6H2)imidazolin-2-ylidene
- LUMO:
-
Lowest occupied molecular orbital
- Mes:
-
Mesityl (=2,4,6-Me3C6H2)
- Mes*:
-
2,4,6-(t-Bu)3C6H2
- NHC:
-
N-heterocyclic carbene
- NMR:
-
Nuclear magnetic resonance
- THP:
-
Tetrahydropyran
- TMEDA:
-
Tetramethylethylenediamine
- Trip:
-
2,4,6-(i-Pr)3C6H2
- UV/Vis:
-
Ultraviolet/visible
- VT:
-
Variable temperature
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Wehmschulte, R.J. (2012). Low Valent Organoaluminum (+I, +II) Species. In: Woodward, S., Dagorne, S. (eds) Modern Organoaluminum Reagents. Topics in Organometallic Chemistry, vol 41. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3418_2012_34
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