Complexes of trialkylaluminum compounds with polyfunctional ethers

Triethyl-, triisobutyl-, and tri-n-hexylaluminum form complexes with monoglyme, diglyme, and triglyme in which the alkylaluminum compounds are involved in rapid chemical exchange. The monoglyme complexes undergo little, or no, measurable dissociation as determined by 1H NMR studies, whereas those of...

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Published inInorganica Chimica Acta Vol. 85; no. 2; pp. 185 - 189
Main Authors Shuler, R.L., De Marco, R.A., Berry, A.D.
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.06.1984
Elsevier Science
Subjects
Al, ga, in, tl, zn, cd, hg derivatives
Chemistry
Exact sciences and technology
Organic chemistry
Organometalloidal and organometallic compounds
Preparations and properties
Organic solvent
Ether
Organic ligand
Reaction mechanism
NMR spectrometry
Aluminium Organic compounds
Exchange reaction
Thermodynamic properties
Aluminium III Complexes
Activation energy
Formation
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Summary:Triethyl-, triisobutyl-, and tri-n-hexylaluminum form complexes with monoglyme, diglyme, and triglyme in which the alkylaluminum compounds are involved in rapid chemical exchange. The monoglyme complexes undergo little, or no, measurable dissociation as determined by 1H NMR studies, whereas those of diglyme and triglyme dissociate more extensively. Low-temperature NMR studies in cyclopentane of the triethylaluminum-diglyme complex in the presence of excess triethylaluminum result in an activation energy of 6.1 kcal/mol for the exchange of complexed and free triethylaluminum. This comparatively low value suggests that exchange in this system may be occuring by a bimolecular displacement mechanism rather than a simple bond-breaking dissociation process.
ISSN:0020-1693
1873-3255
DOI:10.1016/S0020-1693(00)80999-8