Tetrachlorobenzene is any of three isomeric chlorobenzenes with the molecular formula C6H2Cl4. They differ by the positions of the chlorine atoms around the ring. Tetrachlorobenzenes are colorless crystalline compounds.[1]

Tetrachlorobenzene

1,2,3,4-Tetrachlorobenzene

1,2,3,5-Tetrachlorobenzene

1,2,4,5-Tetrachlorobenzene
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.032.390 Edit this at Wikidata
EC Number
  • 1,2,4,5: 202-466-2
  • 1,2,3,5: 211-217-7
  • 1,2,3,4: 211-214-0
KEGG
RTECS number
  • 1,2,4,5: DB9450000
UNII
  • 1,2,4,5: InChI=1S/C6H2Cl4/c7-3-1-4(8)6(10)2-5(3)9/h1-2H
    Key: JHBKHLUZVFWLAG-UHFFFAOYSA-N
  • 1,2,3,5: InChI=1S/C6H2Cl4/c7-3-1-4(8)6(10)5(9)2-3/h1-2H
    Key: QZYNWJQFTJXIRN-UHFFFAOYSA-N
  • 1,2,3,4: InChI=1S/C6H2Cl4/c7-3-1-2-4(8)6(10)5(3)9/h1-2H
    Key: GBDZXPJXOMHESU-UHFFFAOYSA-N
  • 1,2,4,5: C1=C(C(=CC(=C1Cl)Cl)Cl)Cl
  • 1,2,3,5: C1=C(C=C(C(=C1Cl)Cl)Cl)Cl
  • 1,2,3,4: C1=CC(=C(C(=C1Cl)Cl)Cl)Cl
Properties
C6H2Cl4
Molar mass 215.88 g·mol−1
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Properties

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Selected Physical Properties of Individual Isomers
isomer m.p. (°C) b.p. (°C) m.p. (g/cm3 @100 °C)
1,2,3,4 47 254 1.539
1,2,3,5 51.5 246 1.523
1,2,4,5 141 245 1.454

Synthesis

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1,2,4,5-Tetrachlorobenzene can be produced by electrophilic halogenation of benzenes and some chlorobenzenes.[2] 1,2,3,4-Tetrachlorobenzene can only be produced by chlorination of 1,3,5-trichlorobenzene.

Uses

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1,2,4,5-tetrachlorobenzene once was used as intermediates in the production of pesicides,[3] specifically trichlorophenols. This method has been discontinued because it also produced 2,3,7,8-tetrachlorodibenzo-p-dioxin.[1]

See also

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References

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  1. ^ a b Beck, Uwe; Löser, Eckhard (2011). "Chlorinated Benzenes and Other Nucleus-Chlorinated Aromatic Hydrocarbons". Ullmann's Encyclopedia of Industrial Chemistry. doi:10.1002/14356007.o06_o03. ISBN 9783527303854.
  2. ^ "US4205014A Process for 1,2,4,5-tetrachlorobenzene". Espacenet. Retrieved 22 June 2023.
  3. ^ NTP Toxicity Study Reports. National Toxicology Program. 1991. p. 11. Retrieved 22 June 2023.