Lithium trialkylaluminum hydride

Lithium trialkylaluminum hydrides, such as lithium diisobutyl(methyl)aluminum hydride (15), which can be readily prepared by the interaction of diisobutylaluminum hydride with methyllithium in DME, are useful for the anti hydroalumination of internal alkynes (equation 9). ... 

Because the reaction of lithium hydride with ethylene was too slow, he substituted the more reactive lithium aluminum hydride. Subsequently, he found that triethylaluminum added to ethylene produced a higher molecular weight trialkylaluminum. This reaction which was investigated by his former student H. Gellert was appropriately called the aufbau or build up" reaction. 

Al-Tl Catalyst for cis-1,4-Poly isoprene. Of the many catalysts that polymerize isoprene, four have attained commercial importance. One is a coordination catalyst based on an aluminum alkyl and a vanadium salt which produces />mf-l,4-polyisoprene. A second is a lithium alkyl which produces 90% j -l,4-p olyis oprene. Very high (99%) cis- 1,4-polyisoprene is produced with coordination catalysts consisting of a combination of titanium tetrachloride, TiCl4, plus a trialkylaluminum, R3A1, or a combination ofTiCl4 with an alane (aluminum hydride derivative) (86—88). 

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