Boron tribromide, additionally known together tribromoborane, is an not natural compounds really used in necessary synthesis together catalyst and also intermediary through the chemical and also electronic industries.

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Formula and also structure: The boron tribromide chemical formula is BB3. That is molar mass is 250.522 g mol-1. Boron atom is in the molecule center and also forms three straightforward bonds through each bromine. BBr3 molecule is an exception to the rule of octet of valence electrons. Boron tribromide has a planar-trigonal structure, thus, there is 120º in between each bonds. Its chemistry structure can be written as below, in the common representations supplied for essential molecules.


Occurrence: Boron bromide is too reactive to exist in nature. It to be synthesized through the very first time in 1846.

Preparation: Boron tribromide is prepared from different reactions. In industry, the most used process is the reaction, that boric oxide, carbon and bromine at temperature above 300 ºC . This reaction can likewise be ready from boron carbide and bromine. Other technique to all set boron bromide, is the reaction of sodium tetrafluoroborate through magnesium bromide.

Physical properties: Boron tribromide is a colorless come amber liquid, with a pungent odor. Its thickness is 2.643 g ml-1. The melting and boiling points space -46 ºC and also 91 ºC, respectively. It dissolve sulfur dioxide, sulfur dichloride and carbon tetrachloride. Boron bromide is decomposed by water and alcohols.

Chemical properties: Boron bromide is a solid Lewis acid (an electrophilic specie that can accept electron from a Lewis basic to kind an adduct). For that, that is used for the cleavage of aryl alkyl ethers; boron atom in BBr3 has an north p-orbital, which is struck preferentially by the oxygen, thus, the ether molecule is cleavage:

ROR´ + BBr3 → ROBBr2 + R´Br


This reaction is adhered to by a hydrolysis reaction, to give a hydroxyl group, boric acid and also hydrogen bromide:

ROBBr2 + 3H2O → ROH + B(OH)3 + 2HBr

Uses: Boron tribromide is mostly used as a semiconductor silicon doping resource in digital manufacturing. It is a raw material to acquire caustic soda and soda ash. Pharmaceutical industry uses boron tribromide to encourage the dealkylation the aryl akyl ethers and also as catalyst in part reactions early its electrophilic character.

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Health effects/safety hazards: Boron tribromide is extremely toxic through inhalation. That is deadly by ingestion. The is corrosive come tissues. Once heated, it emits toxicity fumes that bromide. Boron tribromide is corrosive to metals, wood and rubber. In water, over there is risk of fire or explosion.