Triisobutylaluminum (TIBA) is a chemical compound with the formula (C4H9)3Al. It is an organoaluminum compound that is widely used as a catalyst in various chemical reactions. TIBA is a colorless liquid that is highly flammable and reacts violently with water, air, and other oxidizing agents.

TIBA is primarily used as a co-catalyst in the Ziegler-Natta polymerization of olefins, such as ethylene and propylene, to produce polyolefins with controlled molecular weights and structures. It helps to control the polymerization process and improve the efficiency of the catalyst system.

In addition to its use in polymerization reactions, TIBA is also used as a reducing agent in organic synthesis and as a catalyst in various other reactions, such as the Friedel-Crafts alkylation and acylation reactions. It can also be used as a Lewis acid catalyst in the synthesis of organic compounds.

However, TIBA is highly reactive and requires careful handling due to its pyrophoric nature. It should be stored and handled in a dry and inert atmosphere, and contact with air, moisture, or other reactive substances should be avoided.

Overall, Triisobutylaluminum is an important compound in the field of catalysis and organic synthesis, with various applications in the production of polymers and other organic compounds.