BMe3

BMe3, or trimethylborane, is an organoboron compound with the formula B(CH3)3. The boron center is three-coordinate and trigonal planar, which gives BMe3 a relatively strong Lewis-acid character. It is a volatile, colorless species at room temperature and readily forms adducts with Lewis bases such as ethers and amines.

Reactivity and properties: BMe3 is highly reactive toward moisture and air. On contact with water, it hydrolyzes rapidly to boric acid and methane according to the general equation: B(CH3)3 + 3 H2O → B(OH)3 + 3 CH4. This sensitivity to moisture requires handling under strictly anhydrous, inert conditions. In the absence of water, BMe3 can bind to Lewis bases to form adducts, which can alter its reactivity and applications.

Applications: In synthesis, BMe3 serves as a volatile boron source for delivering boron in processes such as chemical vapor deposition (CVD) to produce boron-containing films, including boron nitride and related materials. It also functions as a precursor in organoboron chemistry, enabling the introduction of boron into organic substrates through adduct formation and subsequent transformations. Its use is typically limited to controlled environments due to its reactivity with air and moisture.

Preparation and handling: BMe3 is usually prepared and employed under strictly anhydrous conditions and is often generated in situ or stored under inert gas. Safe handling requires use in a properly functioning fume hood with appropriate personal protective equipment, and storage away from moisture and oxidants.

See also: boranes, organoboron chemistry, chemical vapor deposition.