iBu3Al

iBu3Al, also known as triisobutylaluminum, is an organoaluminum compound with the chemical formula Al(CH2CH(CH3)2)3. It is a colorless liquid at room temperature and is pyrophoric, meaning it ignites spontaneously in air. This property necessitates careful handling and storage under an inert atmosphere, such as nitrogen or argon.

Triisobutylaluminum is primarily used as a co-catalyst in the Ziegler-Natta polymerization of olefins, particularly in the production of polyethylene and polypropylene. It plays a crucial role in activating the transition metal catalyst, influencing the polymer's molecular weight, branching, and stereochemistry. Its ability to scavenge impurities like water and oxygen from the reaction mixture also contributes to catalyst longevity and efficiency.

Beyond polymerization, iBu3Al finds applications as a reducing agent in organic synthesis. It can reduce various functional groups, although it is less reactive than other aluminum hydrides. It also serves as an alkylating agent in certain reactions. Due to its reactivity and pyrophoric nature, iBu3Al is typically handled in specialized laboratory settings or industrial processes with strict safety protocols. Its commercial availability is generally in solutions of hydrocarbon solvents to mitigate its hazards.