AlC2H53

AlC2H53, commonly written as Al(C2H5)3 or triethylaluminum (TEA), is an organoaluminum compound in which a central aluminum atom is bonded to three ethyl groups. In practice it often exists as oligomeric species (such as dimers) in the neat liquid, while in hydrocarbon solvents it behaves as a highly reactive alkylating agent.

Triethylaluminum is a colorless to pale yellow, highly volatile liquid that is extremely reactive with air and with water. It hydrolyzes rapidly on contact with moisture, releasing heat and forming aluminum hydroxide and ethane. Because of its pyrophoric nature, TEA is routinely handled under strict inert conditions and stored in dry, hydrocarbon solvents such as hexane, under nitrogen or argon.

Industrial and laboratory uses are dominated by its role as a catalyst cocatalyst and alkylating agent in olefin polymerization and related processes. It is widely employed in conjunction with other catalysts (for example, certain Ziegler–Natta systems) to improve activity and control by scavenging impurities (water, oxygen) and by supplying reactive alkyl groups. TEA also serves as a precursor to other organoaluminum compounds and as a versatile reagent in organic synthesis under carefully controlled, inert conditions.

Safety considerations are central to handling TEA. It is highly flammable and can ignite spontaneously in air. Contact with moisture or water leads to vigorous hydrolysis. Proper storage, transfer, and use require inert atmosphere techniques, appropriate containment, and protective equipment to minimize exposure and risk.