Triethylborane, also known as TEB, is a chemical compound with the formula C6H15B. It is commonly used as a reducing agent and as a flame retardant in the production of plastics. Triethylborane is also a popular reagent in organic chemistry for its ability to initiate the polymerization of certain monomers. Synonyms for triethylborane include boron triethyl, triethylboron, and TEBA. Additionally, the compound is sometimes referred to by its trade name, Et3B. Regardless of the name used, triethylborane remains an important compound used in various industrial and research applications.