Studies on Alkyl Metal Alkoxides of Aluminium, Gallium, and Indium, II. A Gas Phase Electron Diffraction Investigation of the Dimethylaluminium Methoxide Trimer, [(CH3)2AIOCH3]3

Drew, D. A.; Haaland, Arne; Weidlein, Johann

doi:10.1002/zaac.19733980304

Cited by 42 publications

(7 citation statements)

References 17 publications

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“…In order to minimize inductive effects we confine ourselves to species with hydrogen and alkyl substituents. (Me,AI), (p-OMe), 11 11401 gas electron diffraction. In all these compounds we describe the endocyclic bonds as half dative and half covalent.…”

Section: Some Polynuclear Aln Compoundsmentioning

confidence: 99%

Covalent versus Dative Bonds to Main Group Metals, a Useful Distinction

Haaland

1989

Angew. Chem. Int. Ed. Engl.

556

392

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Textbooks of inorganic chemistry describe the formation of adducts by coordination of an electron donor to an electron acceptor, often using the amine-boranes, X,N + BY,, as examples. In the Lewis (electron dot) formulas of the compounds, the dative bond in H,N -+ BH, and the covalent bond in H,C-CH, are both represented by a shared electron pair. In the simple molecular orbital or valence bond models the wave functions of both electron pairs would be constructed in the same manner from the appropriate sp3 type atomic orbitals on the bonded atoms: the difference between the covalent and the dative bond becomes apparent only after the orbital coefficients have been analyzed. This may be the reason why many structural chemists seem reluctant to distinguish between the two types of bonds. The object of this article is to remind the reader that the physicochemical properties of covalent and dative bonds may be-and often are-quite different, and to show that a distinction between the two provides a basis for understanding the structures of a wide range of main group metal compounds.

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Section: Some Polynuclear Aln Compoundsmentioning

confidence: 99%

Covalent versus Dative Bonds to Main Group Metals, a Useful Distinction

Haaland

1989

Angew. Chem. Int. Ed. Engl.

556

392

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“…[30] From astructural point of view,a luminium organooxide formation [31] and di-/trimerization is welle stablished, [32] for example, the simple aluminium alkoxide Me 2 AlOMeh as been shown to be trimeric. [33,34] In this work we model the reaction of TMA with synthetic POEs and elucidate intermediates along the reaction pathway between TMA and esters in general for the first time. Structure and stability are monitored for intermediate complexes and solution data clarify the reaction stoichiometry.…”

Section: Introductionmentioning

confidence: 99%

“…However, this has tended to focus not upon its synthesis as a by‐product of ketonization reactions but rather on the oxophilic derivatization of Al−C bonds by moisture or oxygen . From a structural point of view, aluminium organooxide formation and di‐/trimerization is well established, for example, the simple aluminium alkoxide Me 2 AlOMe has been shown to be trimeric …”

Section: Introductionmentioning

confidence: 99%

Reactions of Trimethylaluminium: Modelling the Chemical Degradation of Synthetic Lubricants

Slaughter

Peel

Wheatley

2016

Chemistry A European J

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In investigating and seekingt om imic the reactivity of trimethylaluminium (TMA) with synthetic, ester-based lubricating oils, the reaction of methylp ropionate 1 wase xplored with 1, 2a nd 3equivalents of the organoaluminium reagent. Spectroscopica nalysis pointst ot he formation of the adduct 1(TMA) accompanied only by the low level 1:1 production of Me 2 AlOCEtMe 2 2 and Me 2 AlOMe 3 when an equimolar amount of TMA is applied. The deploymento f excess TMA favoursr eactiont og ive 2 and 3 over 1(TMA) adductf ormation and spectroscopy reveals that in hydrocarbon solution substitution product 2 traps unreacted TMA to yield 2(TMA).

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“…The earliest report of the preparation of a dimethylaluminium alkoxide was that of the methoxide 1 via the exchange reaction (2).' However, subsequently, Mole showed 2AlMe, + Al(OMe)3 -3Me2Al(OMe) a wide variety of dimethylaluminium alkoxides have been reported,12 however in all cases where their molecularity was determined by solution molecular weight measurements they were found to exist as dimers (11). It is perhaps tempting, therefore, to conclude that the presence of ligands sterically more hindered than the methyl of the methoxide group precludes the formation of trimeric compounds.…”

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confidence: 99%