Formula SOBr2 Boiling point 68 °C Appearance colorless liquid | Density 2.69 g/cm³ Molar mass 207.87 g/mol Pubchem 68176 | |
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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 is used for some brominations of certain α,β-unsaturated carbonyls, and it also converts alcohols to alkyl bromides. Otherwise it hydrolyzes readily to release sulfur dioxide:
SOBr2 + H2O → SO2 + 2HBrSafety
SOBr2 hydrolyzes readily to release dangerous HBr and acts as a lachrymator.
References
Thionyl bromide Wikipedia(Text) CC BY-SA