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IUPAC name Iodobenzene
CAS number 591-50-4
SMILES Ic1ccccc1
Molecular formula C6H5I
Molar mass 204.00837 g/mol
Density 1.831 g/cm3
Melting point

-29 °C

Boiling point

188 °C

Except where noted otherwise, data are given for
materials in their standard state
(at 25 °C, 100 kPa)

Infobox disclaimer and references

Iodobenzene is an organic compound consisting of a benzene ring substitituted with one iodine atom. It is useful as a synthetic intermediate in organic chemistry. Since the C-I bond is weaker than C-Br or C-Cl, it is more reactive than bromobenzene or chlorobenzene. Iodobenzene can react with magnesium to form a Grignard reagent, phenylmagnesium iodide. Phenylmagnesium iodide, like the bromide analog, is a synthetic equivalent for the phenyl synthon. It can also serve as a substrate for the Sonogashira coupling, reacting it with an alkyne.


Iodobenzene is commercially available, but it may be prepared in the laboratory from aniline. In the first step, the amine functional group is diazotized with hydrochloric acid and sodium nitrite. Potassium iodide is added to the resultant diazonium chloride, causing nitrogen gas to evolve. Any excess nitrite is hydrolyzed with a strong base; the mixture is acidified and the desired product is separated by steam distillation.[1]

Alternatively, it may be produced by refluxing iodine and nitric acid with benzene. [2]


  1. ^ H. J. Lucas, E. R. Kennedy (1939). "Iodobenzene". Org. Synth.; Coll. Vol. 2: 351. 
  2. ^ F. B. Dains and R. Q. Brewster (1941). "Iodobenzene". Org. Synth.; Coll. Vol. 1: 323. 

See also

  • Gattermann-Wieland, "Laboratory Methods of Organic Chemistry," p. 283. Translated from the twenty-fourth German edition by W. McCartney, The Macmillan Company, New York, 1937.
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Iodobenzene". A list of authors is available in Wikipedia.
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