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Thionyl bromide

From Wikipedia, the free encyclopedia

Thionyl bromide
Molecular arrangement in solid SOBr2 (note that this is dramatically different from the crystal structure of its chloride analogue)
IUPAC name
Thionyl bromide
Other names
Sulfur oxy dibromide
3D model (JSmol)
ECHA InfoCard 100.007.332
Molar mass 207.87 g/mol
Appearance colorless liquid
Density 2.688 g/mL, liquid
Melting point −52 °C (−62 °F; 221 K)
Boiling point 68 °C (154 °F; 341 K) at 40 mmHg
Solubility reacts in HBr, acetone, and alcohol
soluble in benzene, toluene, ether
trigonal pyramidal
Main hazards Readily decomposes in air to toxic gases
Safety data sheet "External MSDS"
R-phrases (outdated) R14 R20/21/22 R29[1] R34
S-phrases (outdated) (S1/2) S8[1] S26 S30 S36/37/39 S45
Flash point Non-flammable
Related compounds
Related compounds
SOCl2, SeOCl2;

PBr3, Br2

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
☒N verify (what is ☑Y☒N ?)
Infobox references

Thionyl bromide is the chemical compound SOBr2. It is less stable and less widely used than its chloride analogue, thionyl chloride. It is prepared by the action of hydrogen bromide on thionyl chloride, a characteristic reaction where a stronger acid is converted to a weaker acid:

SOCl2 + 2HBr → SOBr2 + 2HCl

Thionyl bromide will convert alcohols to alkyl bromides and can be used for brominations of certain α,β-unsaturated carbonyl compounds.


SOBr2 hydrolyzes readily in air to release dangerous fumes of sulfur dioxide and hydrogen bromide

SOBr2 + H2O → SO2 + 2HBr


Mundy, B. P. (2004). "Thionyl Bromide". In Paquette, E. (ed.). Encyclopedia of Reagents for Organic Synthesis. New York: J. Wiley & Sons. doi:10.1002/047084289X.rt098.

This page was last edited on 22 May 2019, at 01:51
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