Reactions of Organoaluminum Compounds

Reactions of Okganoaluminum Compounds with Othek Metal Compounds 

Exchange reactions between trialkyl or triaryl alanes and metal alkyls or aryls have been described for elements of the second (Mg), third (B), 

Trialkyl alanes also form association products with the alkyls of the alkali and alkaline earth metals, but these are very stable and some are saltlike complexes (cf. Section IV,C). An alkyl exchange such as 

Alkyl and aryl exchange reactions between trialkyl alanes and trialkyl or triaryl boranes have been very fully investigated (188). The exchange of ligands, which occurs very rapidly even at room temperature, occurs through the association products like  

The mixed associates cannot, however, be isolated and it is not yet known if the extent of association is sufficiently great to be detected by the usual methods (e.g., cryoscopy). To explain the readiness of exchange it is sufficient to assume that association occurs, although the equilibrium involved may correspond with almost complete dissociation. In connection with the exchange between alkyls (or aryls) of boron and aluminum, it may be noted that the trialkyl boranes, unlike the aluminum compounds, exist only as 

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The sodium fluoride-water work-up offers an excellent method for large-scale preparations, and is generally applicable, for product isolation in the reaction of organoaluminum compounds. ... 

Tolstikov, G A, Prokhorova, N A, Spivak, A Y, Khalilov, L M, Sultanmuratova, V R, Synthesis of C-glucopyranosides by reaction of organoaluminum compounds with 2,3,4,6-tetra-O-henzyl-a-D-glucopyranoside, Zh. Org. Khim., 27, 2101-2106, 1991. 

SCHEME 10.59 Bicyclic oxazolidinones derived fiom carbohydrates are efficient chiral auxiliaries in conjugate addition reactions of organoaluminum compounds. 

A. Reactions of Organoaluminum Compounds with Other Metal Compounds 299... 

D. Reactions of Organoaluminum Compounds Involving Destruction of A1—C and A1—H Bonds... 

In the case of using ethylene in place of the isobutylene in the reaction shown in eq. (7.1), the reaction requires a high temperature and a high pressure, and the production amount of the long chain alkylaluminum increases. But, the formation reaction of the long chain alkyl with branched olefins such as isobutylene, does not proceed easily [13]. As the other synthetic reactions of organoaluminum compounds, two reaction processes are available. The first one is the sesqui process. This process is the direct reaction of alkyl halides with aluminum. As shown in eqs. 

Since organoaluminums are highly oxophilic, the reaction of organoaluminum compounds and various carbonyl compounds gives 1 1 Lewis acid-base complexes. In the cases of alkylaluminums and electrophilic carbonyl compounds, alkyl transfer reactions to carbonyl carbon proceed via Lewis acid-base complexes at high temperature [37, 38]. 

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