Boron tribromide

Tribromoborane

Colorless liquid with a pungent odor

Liquid

2.64 g · cm -3

-46 ° C

91 ° C

72 hPa ( 20 ° C)

Violent decomposition in water

1.312 ( 16 ° C)

Risk

-239.7 KJ / mol

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Boron tribromide is a chemical compound consisting of the elements boron and bromine with the empirical formula BBr3.

Representation

Boron tribromide can be represented: 1 by the reaction of boron trifluoride with aluminum bromide

2 by the reaction of boron carbide with elemental bromine in the quartz tube at elevated temperature

Properties

Boron tribromide is a very toxic fumes in moist air connection, which is present at room temperature as a liquid. It is commercially available and a strong Lewis acid.

By hydrolysis is a decomposition into boric acid and hydrobromic acid:

Use

Boron tribromide can be used for the cleavage of ethers under mild conditions, in particular for mild cleavage of alkyl aryl ethers. In addition, it is also used for the olefin polymerization using Friedel -Crafts reactions. In the electronics industry, it is used as Borlieferant in doping of semiconductors.