Abstract

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.

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