1,2,4-Trichlorobenzene

1,2,4-Trichlorobenzene
Names
IUPAC name
1,2,4-Trichlorobenzene
Identifiers
120-82-1 YesY
ChEBI CHEBI:28222 N
ChemSpider 12 YesY
Jmol interactive 3D Image
PubChem 13
UNII 05IQ959M1N YesY
Properties
C6H3Cl3
Molar mass 181.45 g mol−1
Appearance Colorless liquid
Odor aromatic[1]
Density 1.46 g cm−3
Melting point 16.9 °C (62.4 °F; 290.0 K)
Boiling point 214.4 °C (417.9 °F; 487.5 K)
0.003% (20°C)[1]
Vapor pressure 1 mmHg (20°C)[1]
Hazards
Flash point 110 °C (230 °F; 383 K)
Explosive limits 2.5%-6.6% (150°C)[1]
US health exposure limits (NIOSH):
none[1]
C 5 ppm (40 mg/m3)[1]
N.D.[1]
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
N verify (what is YesYN ?)
Infobox references

1,2,4-Trichlorobenzene is an organochlorine compound, one of three isomers of trichlorobenzene. It is a derivative of benzene with three chloride substituents. It is a colorless liquid used as a solvent for a variety of compounds and materials.

Production and uses

Depending on the conditions and additives (e.g., sulfur), it can be the main product from the chlorination of benzene. It is virtually the exclusive product from the chlorination of 1,4-dichlorobenzene. It is also the main product from the dehydrochlorination of hexachlorocyclohexane.[2]

It is useful as a high-temperature solvent, e.g. for GPC of polyolefines such as PE or PP which are otherwise insoluble.

Aside from its use as a solvent, this compound is a useful precursor to dye and pesticides.

Safety

The LD50 (oral, rats) is 756 mg/kg. Animal studies have shown that 1,2,4-Trichlorobenzene affects the liver and kidney, and is possibly a teratogen.[3] There is no regulated occupational exposure limit for chemical exposure, but the National Institute for Occupational Safety and Health recommends no greater exposure than 5 ppm, over an 8-hour workday.

References

  1. 1 2 3 4 5 6 7 "NIOSH Pocket Guide to Chemical Hazards #0627". National Institute for Occupational Safety and Health (NIOSH).
  2. Beck, U.; Löser, E. (2005), "Chlorinated Benzenes and other Nucleus-Chlorinated Aromatic Hydrocarbons", Ullmann's Encyclopedia of Industrial Chemistry, Weinheim: Wiley-VCH, doi:10.1002/14356007.o06_o03
  3. CDC - NIOSH Pocket Guide to Chemical Hazards

See also


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