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Skeletal formula
Ball-and-stick model
IUPAC name
Other names
Asymmetrical trimethylbenzene,
95-63-6 YesY
ChEBI CHEBI:34039 YesY
ChemSpider 6977 YesY
Jmol 3D model Interactive image
KEGG C14533 YesY
Molar mass 120.19 g/mol
Appearance Colorless liquid
Density 0.8761 g/cm3
Melting point −43.78 °C (−46.80 °F; 229.37 K)
Boiling point 169 to 171 °C (336 to 340 °F; 442 to 444 K)
Safety data sheet Sigma-Aldrich MSDS
Harmful (Xn); Dangerous for the environment (N)
Flash point 44.4 °C (111.9 °F; 317.5 K)
Explosive limits 0.9%–6.4%[2]
US health exposure limits (NIOSH):
PEL (Permissible)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

1,2,4-Trimethylbenzene, also known as psuedocumene, is an organic compound with the chemical formula C6H3(CH3)3. Classified as an aromatic hydrocarbon, it is a flammable colorless liquid with a strong odor. It is nearly insoluble in water but soluble in organic solvents. It occurs naturally in coal tar and petroleum (about 3%).


Industrially, it is isolated from the C9 aromatic hydrocarbon fraction during petroleum distillation. Approximately 40% of this fraction is 1,2,4-trimethylbenzene. It is also generated by methylation of toluene and xylenes and the disproportionation of xylene over aluminosilicate catalysts.[3]


Pseudocumene is a precursor to mellitic anhydride, from which high performance polymers are made. It is also used as a sterilizing agent and in the manufacture of dyes, perfumes, and resins. Another major use is as a gasoline additive.[4]


1,2,4-Trimethylbenzene dissolved in mineral oil is used as a liquid scintillator. [5]

See also[edit]


  1. ^ Merck Index, 11th Edition, 7929
  2. ^ a b "NIOSH Pocket Guide to Chemical Hazards #0638". National Institute for Occupational Safety and Health (NIOSH). 
  3. ^ Karl Griesbaum, Arno Behr, Dieter Biedenkapp, Heinz-Werner Voges, Dorothea Garbe, Christian Paetz, Gerd Collin, Dieter Mayer, Hartmut Höke "Hydrocarbons" in Ullmann's Encyclopedia of Industrial Chemistry 2002 Wiley-VCH, Weinheim. doi:10.1002/14356007.a13_227
  4. ^ "Chemical Summary for 1,2,4-Trimethylbenzene" (text). United States Environmental Protection Agency. 1994-08-01. Retrieved 2008-01-28. 
  5. ^ Mufson, S.; et al. (November 1, 2015). "Liquid scintillator production for the NOvA experiment". Nuclear Instruments and Methods A. 799: 1. arXiv:1504.04035free to read. Bibcode:2015NIMPA.799....1M. doi:10.1016/j.nima.2015.07.026. Retrieved 2016-06-15. 

External links[edit]