Thionyl bromide

Structural formula
General
Surname	Thionyl bromide
Molecular formula	SOBr 2
Brief description	orange-yellow liquid
External identifiers / databases
EC number	208-064-3
ECHA InfoCard	100.007.332
PubChem	68176
Wikidata	Q598605
properties
Molar mass	207.87 g mol −1
Physical state	liquid
density	2.683 g cm −3 (25 ° C)
Melting point	−52 ° C
boiling point	48 ° C (27 hPa); 138 ° C;
Vapor pressure	13 hPa (31 ° C)
solubility	Hydrolysis in water; Soluble in carbon disulphide, benzene, trichloromethane and carbon tetrachloride.;
Refractive index	1.675 (20 ° C)
safety instructions
H and P phrases	H: 312-314-332
	P: 280-305 + 351 + 338-310
	As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . Refractive index: Na-D line , 20 ° C

Thionyl bromide is a chemical compound from the group of thionyl halides . It is the dibromide of sulphurous acid .

Extraction and presentation

Thionyl bromide can be obtained by reacting thionyl chloride with hydrogen bromide or potassium bromide .

{\ displaystyle \ mathrm {SOCl_ {2} +2 \ HBr \ longrightarrow SOBr_ {2} +2 \ HCl}}

It is also possible to display it by reacting sulfur dioxide with bromine in the presence of phosphorus trichloride .

properties

Thionyl bromide is an orange-yellow liquid that slowly decomposes into sulfur dioxide , bromine and disulfur dibromide when standing for a long time, while at the same time turning red. It is very sensitive to moisture and not very temperature resistant. It hydrolyzes with water to form hydrogen bromide and sulfur dioxide.

{\ displaystyle \ mathrm {SOBr_ {2} + H_ {2} O \ longrightarrow SO_ {2} +2 \ HBr}}

The connection is pyramidal with sulfur at the top of the pyramid.

use

Thionyl bromide can be used for the direct bromination of primary alcohols in fluorous phase.

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j data sheet Thionyl bromide, 97% from Sigma-Aldrich , accessed on November 22, 2013 ( PDF ).
^ ^A ^b A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 580.
↑ ^a ^b ^c ^d ^e Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 390.

[Sigma-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j data sheet Thionyl bromide, 97% from Sigma-Aldrich , accessed on November 22, 2013 ( PDF ).

[Arnold_F._Holleman,_Egon_Wiberg,_Nils_Wiberg-2] A ^b A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 , p. 580.

[brauer-3] Georg Brauer (Ed.), With the collaboration of Marianne Baudler u. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume I, Ferdinand Enke, Stuttgart 1975, ISBN 3-432-02328-6 , p. 390.