Acetyl bromide

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Acetyl bromide[1]
Structural formula of acetyl bromide Ball-and-stick model of acetyl bromide
CAS number 506-96-7 YesY
PubChem 10482
ChemSpider 10050 YesY
Jmol-3D images Image 1
Image 2
Molecular formula C2H3BrO
Molar mass 122.95 g/mol
Density 1.663 g/mL
Melting point −96 °C (−141 °F; 177 K)
Boiling point 75 to 77 °C (167 to 171 °F; 348 to 350 K)
EU classification Corrosive C
R-phrases R14 R34
S-phrases S26 S36/37/39 S45
Flash point 110 °C (230 °F; 383 K)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
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Infobox references

Acetyl bromide is an acyl bromide compound. As is expected, it may be prepared by reaction between phosphorus tribromide and acetic acid:[2]

3 CH3COOH + PBr3 → 3 CH3COBr + H3PO3

As usual for an acid halide, acetyl bromide hydrolyzes rapidly in water, forming acetic acid and hydrobromic acid. It also reacts with alcohols and amines to produce acetate esters and acetamides, respectively.


  1. ^ Acetyl bromide at Sigma-Aldrich
  2. ^ Theodore M. Burton and Ed. F. Degering (1940). "The Preparation of Acetyl Bromide". J. Am. Chem. Soc. 62: 227. doi:10.1021/ja01858a502.