Boron tribromide (molecular formula: BBR3) is an inorganic compound, a colorless liquid at room temperature, which reacts with moisture in the air to produce fumes to produce boric acid and hydrogen bromide, which is corrosive to the cornea. When wearing gas masks, gloves and protective clothing, you should pay attention to wearing them. It is strictly forbidden to inhale vapors. Poisoning should be taken to the hospital immediately**.
Uses:
Boron tribromide is a strong Lewis acid that is commonly used to remove methyl or alkyl groups from ether compounds in drug production. In addition, it can also be used as an acid catalyst for olefin polymerization reactions and Friedel-Gram reactions, and as a dopant in the semiconductor industry. It is also a raw material for the manufacture of high-purity boron and other organoboron compounds.
Direct synthesis
The dry elemental boron powder is loaded into the reaction tube of the tubular reactor, and in order to make the reaction can be fully carried out, a certain amount of packing material should be put into the reaction tube, and the packing material is the same as the pipe wall. The reaction tube is heated to 850 °C, and the bromine is also heated to a slight boil in the bromine kettle at the same time, and then passed into the reaction tube. The boron bromide liquid generated by the reaction is heated and refluxed with activated carbon, zinc powder and aluminum chips in the debrominator until the generated boron bromide is colorless, and then through crude distillation and rectification, a completely colorless boron bromide finished product is prepared. Its reaction formula is 2b+3br2 2bbr3