From Wikipedia, the free encyclopedia
Jump to: navigation, search
CAS number 118-75-2 YesY
PubChem 8371
ChemSpider 8068 YesY
KEGG C18933 N
ChEBI CHEBI:36703 YesY
Jmol-3D images Image 1
Molecular formula C6Cl4O2
Molar mass 245.88 g/mol
Appearance yellow solid
Melting point 295–296 °C
R-phrases R36/38 R50/53
S-phrases S37 S60 S61
Except where noted otherwise, data are given for materials in their standard state (at 25 °C (77 °F), 100 kPa)
 N (verify) (what is: YesY/N?)
Infobox references

Chloranil is a quinone with the molecular formula C6Cl4O2. Also known as tetrachloro-1,4-benzoquinone, it is a yellow solid. Like the parent benzoquinone, chloranil is a planar molecule[2] that functions as a mild oxidant.


Chloroanil, more so than benzil, serves as a hydrogen acceptor. It is used for the aromatization reactions, such as the conversion of cyclohexadienes to the benzene derivatives.[3]

Chloranil is used to test for free secondary amines. This test is useful for checking for the presence of proline derivatives. It is also a good test for the successful deprotection of a secondary amine. Secondary amines react with p-chloranil to give a brown/red/orange derivative, the colour depending on the amine. In these reactions, the amine displaces chloride from the ring of the quinone.

See also[edit]


  1. ^ Chloranil at Sigma-Aldrich
  2. ^ J.-M. Lü, S. V. Rosokha, I. S. Neretin and J. K. Kochi, "Quinones as Electron Acceptors. X-Ray Structures, Spectral (EPR, UV-vis) Characteristics and Electron-Transfer Reactivities of Their Reduced Anion Radicals as Separated vs Contact Ion Pairs" Journal of the American Chemical Society 2006 128, 16708-16719.doi:10.1021/ja066471o
  3. ^ Derek R. Buckle "Chloranil" in Encyclopedia of Reagents for Organic Synthesis 2001, John Wiley. doi:10.1002/047084289X.rc057